Cas Glitch: Library Sims Glitching

I didn't really know what to title this but, in cas when using sims I saved in my library, (They are from a different save file then the one I'm currently using) It won't let me change their names if there are multiple sims in household. The name bar shows up as _______(/) (as seen in picture). When I do change the name of one sim, it still shows as _______(/) and copies to the second sim. (hopfully this makes sense, im bad at explaining things.)

Also, I did manage to get one sim into a home by adding her separately, but when I try to edit household to add the other two sims, (Using cas.fulleditmode and mccc) Cas takes FOREVER to load. Yes, I have mods and cc. But, the sim I made from scratch is perfectly fine and is having 0 problems, It's only the ones from my library that are giving me trouble.

I would really hate to make these sims again, because I love how they look and for some reason when I try to recreate a sim I can never get them to look how they previously did. So, I'd like to avoid that if I can!