@KateLemonTea What happens if you reimport that sim but without the slider installed? It's possible the slider no longer works properly.
If you want to save this particular sim, try taking them into CAS and imposing the library copy on top of them.
@KateLemonTea You said you imported a saved sim from your library. That saved sim is what I meant: what happens if you take the affected sim into CAS, then essentially replace that sim with the copy from the library? When you're in CAS, you should be able to open your library and replace the existing sim with the saved version.
If you don't like the effects, you can quit without saving.
