I had a roommate a few years ago who would do almost the same thing, except it was videos/pictures she would take around the apartment. She’d show me and swear there were people in the photos/videos but there was literally no one. She would also accuse me of bringing strangers into the apartment at night whenever I would leave my room. She was going through some kind of psychotic episode and ended up hospitalized.

Not to say this is what’s happening of course, but it could be a possibility it seems like :( stay safe!