If this has been mentioned before, I apologize.
Whenever I have any Sim (regardless of age) play chess (by them selves, or with another Sim) their Mental/Logic skill gets glitched. The percentage keeps going up and up (like I've seen it go over 1000%), even after they stop playing chess. Reset Sim doesn't work. I have to save and quit, when I reload it's back to normal. I've 'repaired' the game through Origin.
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Try this sequence:
Origin > right-click The Sims 4 > Repair Game
followed by a full cache refresh:
1. Move (not copy) Saves, Tray, Mods, Screenshots, and Custom Music folders and the Options.ini file to your desktop. Delete the Scratch subfolder from inside Saves.
2. Delete the rest of the The Sims 4 folder from your Documents > Electronic Arts folder.
3. Start the game, and exit the game. Now you have a fresh Documents > Electronic Arts > The Sims 4 folder.
4. Copy all the folders and the file back and start the game again.