Quick Question How Come My Funiture In My House Keeps Disappearing?

I just had this happen in my game, too. Is Penny Pizazz (or whatever her last name is ) from San MyShuno a klepto? I'm playing a family in Sulani and when she came to visit (alone) she dropped a can of "de-stresser" on the floor by the door. Out of curiosity, I had my Sim drink it and all of a sudden the entire dining set (table and chairs and stuff on the table) disappeared. Gone. Not in inventory. The next night, a bunch of islanders came over for that "you need some extra food" social event (I don't think Penny was in the group, but she does hang around the house a lot for some reason), and when they left I scrolled back to my house to find two counters, a bar stool, a sink, chess table with 2 chairs, and the (infamous) pet food dish at the auto-feeder had disappeared! Did the visitors actually steal all this stuff? I thought it was a weird glitch with Penny the first time, but now I'm wondering what else is going to start disappearing and if it's really because of the visitors or not. I don't use any mods or CC in my game. I've experienced the disappearing pet food dish in past games, but it hasn't happened in a while. I switched families and came back and the stuff is still gone.