@anneke33 I really like the way you think! Too often players just get overly irritated at game quirks like that, so it's refreshing to hear that you "imagine" that this cat just has a slight problem. I also find it most intriguing that only this one cat of yours suffers that issue.
I always have moveobjects enabled as well, even while playing in live-mode, which is NOT something I recommend doing for beginners or casual players as it's easy to lose a plate or empty glass inside a wall or piece of furniture with a single misplaced click. The Sims 4 tends to receive a lot of unnecessary hate, but in my opinion, it is the most flexible and adaptive game-engine ever created when it comes to building and then interacting with that custom build.
By the way, welcome, and Happy Simming!