NPCs Only Take Damage to Knees and Below

[alexixiv]

Attempting to create hostile NPCs but they only seem to receive damage from the knee down. I have tested with a bone knife and a long sword. I set health to 0.1

When attacking the torso, damage decals show up on the body, but they do not take damage. When hitting the knees they take the expected amount of damage.

[alexixiv]

I did more testing, and they will also take damage to their hands and sometimes to their thighs. Torso, Arm, Head, and Chest damage are not registering.