The Sims 4 - Floating Translucent Walls Glitch bug

@miuffy 

Sometimes, things like that will clear up if you save the lot to your Library and then bulldoze the lot.  Then install the copy of the lot that you saved to your Library.

If that doesn't work, I am willing to troubleshoot the lot to see if I can find the cause.  All you need to do is upload the lot to the Gallery and reply here with the name of the lot and your usedID if different than the one you use here (miuffy).

Hope this helps.