Sim Acres, City Themed Late Night/Showtime World-Update 3/13/18

I have had the best time playing this world, but after the Origin update earlier in the week, it has been buggy. I threw a gift giving party and at the end, 3 random Sims added them selves to my household. Added. Themselves. I exited without saving and took another run at it. 3 different random Sims did it again. Pops up in my household queue, sleeps in my bed, raids my fridge. This is just weird. And Spooky. And I ended up doing a force kill on them. Riddle me that, Batman!