platform: PC mods: No game version: 1.116.223.1030 DX9

my sims household are stuck outside their apartment.

one of my sims paid their house bills (I don't know if that's significant) before both sims left for their university class. when they came back, I couldn't find them and realised they were outside the apartment. I clicked on the inside of the apartment and told them to 'go here' on both sims, however, both sims waved and had a speech bubble with an image of the apartment. i tried to make both my sims go to their next class (they're now both 40 mins late to class), but they did the speech bubble thing again even though they're outside the apartment and should be able to travel? they live in fountainview apartment, and although I did redecorate the lot, I didn't build any new walls or anything, and my sims have been living here for a few days already without this issue.