Sims Faces are gone after aging up to teens (with and without mods/cc)

Hi! So I've been playing Sims for about 9 months now and I never had an issue with mods or updates. So I have this family in the game that has two sets of twins and the eldest set has a glitch or bug. They aged up probably today or yesterday from a child to a teen (I am not sure the exact time they aged since I wasn't playing them when it happened). For some reason when they aged up, their whole face is gone except for their teeth. I have tried everything I could think of to fix this. 

- I have removed all mods from the folder,

- disabled the use of mods in the game,

- repaired the game, uninstalled the game,

- and deleted the files except for the tray and saves

but the issue still persists. one interesting note is that when I select one of the premade faces in CAS, their face is visible, but for some reason, the face they were "born with" or "genetically" match their parents, it doesn't show up. they are the only sims with this issue and I've tried aging up other sims to see if it's an issue with teens but they are the only ones. I'm so frustrated and confused as to why this is happening.