put these commands into model.cfg
and exe whenever it changes in-game, just a temp fix
it used to sometimes happen with me in q3, the model was ok but the enemycolors used to change by itself.
Found no other way to fix it other than change it back.

have you tried setting it up in the gui?

Loaded my backup config from two months ago with EXACTLY the same commands.... everything is fine now :)

Wonder how they changed in the first place...