Hello
Remove all your cc/mods from your game and see if that helps.
The faster skills mod has been causing this issue so if you have that mod remove it.
If you have this mod and have removed it, but the skills don't return to the previous levels, you can use the skills cheats to return the skill levels to what they were. http://simsvip.com/sims-4-cheats-codes/#Skills
Comments
Remove all your cc/mods from your game and see if that helps.
The faster skills mod has been causing this issue so if you have that mod remove it.
If you have this mod and have removed it, but the skills don't return to the previous levels, you can use the skills cheats to return the skill levels to what they were.
http://simsvip.com/sims-4-cheats-codes/#Skills
http://forums.thesims.com/en_US/discussion/817478/hello-come-and-introduce-yourself
http://tinyurl.com/OneRoomOneWeek
http://tinyurl.com/rosemow
My Showcase thread https://forums.thesims.com/en_US/discussion/948861/rosemow-s-rooms-showcase