My sim is gaining relationship points randomly?

I'm honestly not sure if this is a bug, or a feature so I hope I'm asking the right place.

I do have mods, but I deleted all of them once to check gameplay and this still occurs.

Basically, my sim would get random relationship gain/decay throughout their day without interacting with anyone. It's mostly gaining, and it's super annoying because now my sim is best friends with people they just met a few days ago who haven't been contacted since then. It happens about once every six sim hours, and gains about 2-4 relationship points every time (I used mods to check their relationship point gains).

I thought maybe it was Social Bunny and deactivated, but said gains still occur. Turns mods off, still occurs. Turned off lifestyles but still occurs. Also, my sim does not have any social traits, and have not completed any aspirations.

Is this part of the game? It's lowkey driving me crazy but I haven't seen anyone else talk about it and I'm not sure if it's a bug or a feature people have just accepted.