Can't click on second floor or have any sims access it!

The second floor of my build can't be clicked on to say "go here" nor can any Sims do anything on the second floor. I've tried removing fences, walls, removing stairs, using ladders, removing 1x1 tiles, moving picture frames, removing roofs, EVERYTHING!! I'm losing my mind! I figured this one would need the gallery, so it's called "pls help my second floor" by junebuggle-taken

As far as I remember, only the Sims outfits have CC, but the build is non-downloaded if that helps!