Items vanishing in lots in eco lifestyle

I had my sims go on a date to a restaurant in Oasis spring. Some random other Sims stole a piano, a table and 4 chairs. Another stole wall decorations. I went up to them and introduce myself, they do not have the klepto trait. I do not currently have the sharing is caring plan in eco lifestyle either because I didn't want this to happen. Now I don't feel like going on "community" lots because they will lose all the items I've previously placed even tho I don't see how it would be logical for a Sim to swipe, steal, etc... from a "restaurant" when my own Sim don't even have the option to do so. Unless you need a specific combo with the recycling trait that we can't see from the meeting up information that displays the sims traits.