Sim hair color changes while sick

Hi, I just experienced a very strange bug with my elder Sim.

She normally has grey hair and got sick (itchy symptoms). And the minute those symptoms appeared, her hair turned black ! Which is her original hair colour, but I wasn't expecting that.

It turned back to normal once she took her medicine though.

Has anyone ever experienced the same thing ?

I do have a few mods in my game (Mc Command, UI cheats and other CC things) but there was no CC on my Sim at the time, don't know if it's related.