Try the following
So, you helped me but not in the intended way 😅
When I did what you said, I noticed there was no new Sims 4 folder after I relaunched the game, and that's when something clicked in my mind : the game was still showing me my mods ! What happened is that I reinstalled the game on an external hard drive a few months ago, but for some reason it's still using the one on my computer, from which I hadn't removed the mods since I didn't think the game still used it. Now I removed the mods from this folder, and the glitch is actually fixed, meaning that the issue was in fact coming from a mod.
Now it raises a new question : why is it still using the old Sims 4 folder that's on my computer since the game is installed on an external hard drive? x)
Anyway thank you very much, now at least I know I simply have to check which mod is the culprit !
