In my first Sims 3 neighbourhood, there was this little girl that looked so weird because she always had a beard. I never controlled her, only had her gravestone after her passing away, so I never tested if I could change it. It looks very similar to this glitch you're having and in my game this never fixed itself. However, that girl was born after the game started, so she wasn't one of those sims that's there from the start and I therefore haven't seen her in my other games since.