This has been happening to me for as long as I can remember, its not new at all! I have no CC and have always noticed if you try to give your male Sims fuller lips, you can put them on them, but you can't mess with them afterwards or they will get thinner, especially the upper lips!
It is very annoying!
Hmm, if this is something that can happen even with only the base game and no added cc then hopefully one day it can be fixed directly by EA. For curiosity's sake, did you install your game using a physical copy? If so I wonder if it has something to do with corrupted files within some of the disks somehow.
