Random sims keep walking through the walls of my apartment

I'm currently playing a household in San Myshuno in one of the starter apartments and I've been noticing lately that each time I play I keep having random sims which aren't even from the apartment building just casually walking through the walls of my apartment building and the just dropping down back onto the ground outside. My doors are locked for everyone except my household so there shouldn't be random sims but they keep just walking through in a straight line as if they are still outside but in my apartment. My sims never interact with them so it's as if they aren' there but its really frustrating.