All values above threshold not displaying changes

[Ajjuarez]

I am testing use cases and my band line is working as long as there is a point that falls within the threshold. In more extreme cases when all values are above the line (which is seen here in potassium which has a max threshold of 5) the line graph should be completely red; however, when all the points fall above the max threshold OR when all the points fall below the min threshold, there are no changes to the line.