diff --git a/rust/crates/cli/src/profile.rs b/rust/crates/cli/src/profile.rs
index 24463fe6..547661fd 100644
--- a/rust/crates/cli/src/profile.rs
+++ b/rust/crates/cli/src/profile.rs
@@ -1057,6 +1057,13 @@ pub fn cmd_profile(a: &crate::args::ProfileArgs) {
             .flat_map(move |gi| (0..n_starts).map(move |si| (seed_idx, gi, si))))
         .collect();
 
+    // The full sweep grid (each focal axis name and its values), shared by
+    // every point. Folded into each point's base identity so a distinct grid
+    // (wider range, more points, shifted bounds) is a distinct run rather than
+    // a silent merge onto the previous grid's cells.
+    let grid_spec: Vec<(String, Vec<f64>)> = focal_grids.iter()
+        .map(|fg| (fg.name.clone(), fg.values.clone()))
+        .collect();
     let resolve_pt = |gi: usize, si: usize, seed: u64|
         -> Result<crate::profile_cas::ResolvedProfilePoint, String>
     {
@@ -1074,6 +1081,7 @@ pub fn cmd_profile(a: &crate::args::ProfileArgs) {
             base_config: &base_config_blob,
             method_config: &method_config_blob,
             focal: &focal,
+            grid: &grid_spec,
             seed,
             start_index: si as u32,
             deps: profile_deps.clone(),
diff --git a/rust/crates/cli/src/profile_cas.rs b/rust/crates/cli/src/profile_cas.rs
index 1afd7438..ea73dd2b 100644
--- a/rust/crates/cli/src/profile_cas.rs
+++ b/rust/crates/cli/src/profile_cas.rs
@@ -53,6 +53,11 @@ pub struct ProfilePointCtx<'a> {
     pub method_config: &'a serde_json::Value,
     /// The pinned focal `(param, value)` for this grid point.
     pub focal: &'a [(String, f64)],
+    /// The full resolved sweep grid — each focal axis name and its values,
+    /// shared across every point of this run. Folded into the base identity so
+    /// a different grid (wider range, more points, shifted bounds) is a
+    /// distinct run rather than a merge onto the previous grid's cells.
+    pub grid: &'a [(String, Vec<f64>)],
     /// The resolved profile seed (the `seed` level hashes this).
     pub seed: u64,
     pub start_index: u32,
@@ -70,6 +75,22 @@ pub fn resolve_profile_point(ctx: &ProfilePointCtx) -> Result<ResolvedProfilePoi
     ensure_finite(ctx.base_config)?;
     ensure_finite(ctx.method_config)?;
 
+    // Canonicalize the sweep grid: axes sorted by name, values ascending, so
+    // the identity depends only on the *set* of cells, not `--sweep` order.
+    let mut axes: Vec<(String, Vec<f64>)> = ctx.grid.to_vec();
+    axes.sort_by(|a, b| a.0.cmp(&b.0));
+    let mut grid: Vec<(ParamId, Vec<FiniteF64>)> = Vec::with_capacity(axes.len());
+    for (name, mut values) in axes {
+        values.sort_by(|a, b| a.partial_cmp(b)
+            .expect("grid values are finite (checked at parse)"));
+        let mut fvs = Vec::with_capacity(values.len());
+        for v in values {
+            fvs.push(FiniteF64::new(v)
+                .map_err(|_| format!("non-finite grid value for axis '{}'", name))?);
+        }
+        grid.push((ParamId(name), fvs));
+    }
+
     let base = ProfileBase {
         model: ModelDigest::from_model(
             ctx.model,
@@ -78,6 +99,7 @@ pub fn resolve_profile_point(ctx: &ProfilePointCtx) -> Result<ResolvedProfilePoi
         ),
         data: data_digests(ctx.data)?,
         base_config: digest_value(ctx.base_config),
+        grid,
         engine: EngineVersion(ctx.engine_version.to_string()),
         deps: Deps(ctx.deps.clone()),
     };
diff --git a/rust/crates/cli/tests/profile_grid_identity.rs b/rust/crates/cli/tests/profile_grid_identity.rs
new file mode 100644
index 00000000..0cd6bbbf
--- /dev/null
+++ b/rust/crates/cli/tests/profile_grid_identity.rs
@@ -0,0 +1,150 @@
+//! A `camdl profile` run's storage folder (its content-addressed *base* dir)
+//! includes the sweep grid, so a **distinct grid is a distinct run**. Before
+//! this, the base was keyed on the model + swept-param *names* but not the
+//! sweep *values*, so re-running the same params over a different range merged
+//! the two grids' cells into one base dir — a jagged union when the cell
+//! coordinates didn't line up (garki report).
+//!
+//! This pins the fix from outside: running two grids (same model + same swept
+//! params, different ranges) into the same output root produces two distinct
+//! base dirs, while re-running the *same* grid reuses its base dir (stable —
+//! still a cache hit within a grid).
+
+use std::collections::BTreeSet;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+fn camdl_bin() -> PathBuf {
+    let manifest = std::env::var("CARGO_MANIFEST_DIR")
+        .expect("CARGO_MANIFEST_DIR set under cargo test");
+    let p = Path::new(&manifest).join("../../target/release/camdl");
+    assert!(
+        p.exists(),
+        "release camdl binary missing: {} - run `make build-rust` or `make test` (gh#105)",
+        p.display()
+    );
+    p
+}
+
+fn camdlc_bin() -> PathBuf {
+    let manifest = std::env::var("CARGO_MANIFEST_DIR")
+        .expect("CARGO_MANIFEST_DIR set under cargo test");
+    let p = Path::new(&manifest).join("../../../ocaml/_build/default/bin/camdlc.exe");
+    assert!(p.exists(), "camdlc.exe missing: {} - run `make build-ocaml`", p.display());
+    p
+}
+
+struct Tmp(PathBuf);
+impl Tmp { fn path(&self) -> &Path { &self.0 } }
+impl Drop for Tmp { fn drop(&mut self) { let _ = std::fs::remove_dir_all(&self.0); } }
+fn tempdir(tag: &str) -> Tmp {
+    let ns = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH).unwrap().as_nanos();
+    let base = std::env::temp_dir().join(format!(
+        "camdl_profile_grid_{}_{}_{}", tag, std::process::id(), ns));
+    std::fs::create_dir_all(&base).unwrap();
+    Tmp(base)
+}
+
+fn write_fixture(dir: &Path) -> (PathBuf, PathBuf) {
+    let camdlc = camdlc_bin();
+    let src = r#"
+time_unit = 'days
+compartments { S, I, R }
+parameters {
+  beta  : rate  in [0.001, 5.0]
+  gamma : rate  in [0.01, 1.0]
+  N0    : count in [100, 10000]
+}
+transitions {
+  infection : S --> I @ beta * S * I / N0
+  recovery  : I --> R @ gamma * I
+}
+observations {
+  cases {
+    columns       { time : time, cases : count }
+    projected  = prevalence(I)
+    emit_schedule = every 1 'days
+    cases ~ poisson(rate = projected)
+  }
+}
+scenarios {
+  baseline { set = { beta = 0.3  gamma = 0.1  N0 = 1000 } }
+}
+init { S = 999  I = 1 }
+simulate { from = 0 'days  to = 6 'days }
+"#;
+    let model_path = dir.join("sir.camdl");
+    std::fs::write(&model_path, src).unwrap();
+    let ir_path = dir.join("sir.ir.json");
+    let out = Command::new(&camdlc).arg(&model_path).output().unwrap();
+    assert!(out.status.success(),
+        "camdlc failed: {}", String::from_utf8_lossy(&out.stderr));
+    std::fs::write(&ir_path, &out.stdout).unwrap();
+
+    let data_path = dir.join("cases.tsv");
+    std::fs::write(&data_path,
+        "time\tcases\n1\t2\n2\t4\n3\t8\n4\t6\n5\t4\n6\t2\n").unwrap();
+    (ir_path, data_path)
+}
+
+/// Run a profile with the given sweep specs into `root` (`CAMDL_OUTPUT_DIR`).
+fn run_profile(bin: &Path, ir: &Path, data: &Path, root: &Path, beta: &str, gamma: &str) {
+    let out = Command::new(bin)
+        .env("CAMDL_SKIP_VERSION_CHECK", "1")
+        .env("CAMDL_OUTPUT_DIR", root)
+        .args([
+            "profile", &ir.to_string_lossy(),
+            "--scenario", "baseline",
+            "--data", &data.to_string_lossy(),
+            "--obs", "cases",
+            "--sweep", beta,
+            "--sweep", gamma,
+            "--algorithm", "if2",
+            "--particles", "30",
+            "--iterations", "5",
+            "--starts", "1",
+            "--rw-sd", "auto",
+            "--seed", "1",
+        ])
+        .output().expect("spawn camdl profile");
+    assert!(out.status.success(),
+        "camdl profile must exit 0.\nstderr:\n{}", String::from_utf8_lossy(&out.stderr));
+}
+
+/// The base dirs under `<root>/profiles/` (the `<stem>-<basehash>` folders).
+fn base_dirs(root: &Path) -> BTreeSet<String> {
+    let profiles = root.join("profiles");
+    std::fs::read_dir(&profiles).map(|rd| rd.flatten()
+        .filter(|e| e.path().is_dir())
+        .map(|e| e.file_name().to_string_lossy().into_owned())
+        .collect()).unwrap_or_default()
+}
+
+#[test]
+fn distinct_grids_get_distinct_base_dirs() {
+    let bin = camdl_bin();
+    let tmp = tempdir("id");
+    let (ir, data) = write_fixture(tmp.path());
+    let root = tmp.path().join("out");
+
+    // Grid A.
+    run_profile(&bin, &ir, &data, &root, "beta=lin(0.1,0.5,3)", "gamma=lin(0.03,0.25,3)");
+    let after_a = base_dirs(&root);
+    assert_eq!(after_a.len(), 1, "one grid → one base dir, got {:?}", after_a);
+
+    // Grid A again — same grid must reuse the same base dir (still cache-stable).
+    run_profile(&bin, &ir, &data, &root, "beta=lin(0.1,0.5,3)", "gamma=lin(0.03,0.25,3)");
+    assert_eq!(base_dirs(&root), after_a,
+        "re-running the SAME grid must reuse its base dir, not fork a new one");
+
+    // Grid B — same model + same swept params, DIFFERENT ranges. Must be its
+    // own base dir, not a merge onto grid A (the garki bug).
+    run_profile(&bin, &ir, &data, &root, "beta=lin(0.2,0.6,3)", "gamma=lin(0.05,0.3,3)");
+    let after_b = base_dirs(&root);
+    assert_eq!(after_b.len(), 2,
+        "a DIFFERENT grid must create a distinct base dir, not merge onto the \
+         previous one — got {:?}", after_b);
+    assert!(after_b.is_superset(&after_a),
+        "grid A's base dir must still be present alongside grid B's");
+}
diff --git a/rust/crates/runid/src/inputs.rs b/rust/crates/runid/src/inputs.rs
index f5d6254f..76a9b742 100644
--- a/rust/crates/runid/src/inputs.rs
+++ b/rust/crates/runid/src/inputs.rs
@@ -406,15 +406,28 @@ pub struct SurveyInput {
 //                   (seed, start) pair pins the sub-fit's init deterministically.
 
 /// The shared `profile`-level digest: the inference problem being profiled,
-/// with the focal grid and method config excluded. `deps` carries the base
-/// fit's `starts_from` lineage (same deps-DAG mechanism as a fit stage).
-#[derive(Debug, Clone, PartialEq, Eq, RunInput)]
+/// including the sweep grid so a distinct grid is a distinct run. `deps`
+/// carries the base fit's `starts_from` lineage (same deps-DAG mechanism as a
+/// fit stage).
+///
+/// The grid is part of the identity (not `Eq` because it carries floats — same
+/// as [`ProfilePointConfig`]). Two runs with the same problem but a *different*
+/// grid — a wider range, more points, shifted bounds — get different base dirs
+/// rather than silently merging their cells onto one another (which produced a
+/// jagged union when the cell coordinates didn't line up). Re-running the
+/// *same* grid is stable (a cache hit); the method config still lives in the
+/// `stage` level, not here.
+#[derive(Debug, Clone, PartialEq, RunInput)]
 pub struct ProfileBase {
     pub model: ModelDigest,
     pub data: Vec<DataDigest>,
     /// Canonical digest of the base config (base params + fixed + obs + priors
-    /// + fit.toml) — grid and method config excluded.
+    /// + fit.toml) — method config excluded (it lives in `stage`).
     pub base_config: ContentHash,
+    /// The resolved sweep grid: each focal axis and its values, canonicalized
+    /// (axes sorted by name, values ascending) so the identity is independent
+    /// of `--sweep` argument order.
+    pub grid: Vec<(ParamId, Vec<FiniteF64>)>,
     pub engine: EngineVersion,
     pub deps: Deps,
 }