Can't change eye colour for sims after using modify CAS

I am trying to change my sim's eye colour after she became a vampire with cas.fulleditmode, but every time I go back into live mode the change is nullified and her eye colour swaps to a completely different one (black, grey, blue) from her original one (red) or her intended change (spellcaster red). I run no mods, so this is vanilla. A fix would be appreciated.