Gnomes Glitch-Dancing/ Jumping around

I don't use any mods or cc, and I noticed after the Harvestfest day ended, the gnomes are still shaking and jumping around, though they now stay where I put them. Thought it was a new, albeit annoying, feature. Hope it's not. Maybe. It's creepy, but kinda funny/fitting at the same time. 

I have already repaired my game, because I was having issues getting my young adult sim to do ANYTHING once her newborn hit the infant birthday. But that's a separate issue, and thankfully it's not causing problems with the 2nd infant now.