Cast bar interruptable colors

[machostache]

I'm having an issue setting a custom color for the interruptable cast bars.

I've unchecked 'use general' under cast bar colors on appearance and set the color for interruptable casts to blue, but when in combat, the enemy cast bar colors still appear red/orange most of the time. Sometimes they show up blue, but it's not dependable. I have the cast bars on the kui nameplates set to blue for interruptable and that seems to work every time (which is how I know the realui cast bars are not the right color).

No errors/bugs are recorded.