Since I changed the entire house to winter there aren't anymore mod messups. But when there were when I changed from Lyssarias Deluxe House to BayouBlondes Tropical House here were the messups.
Shed was black with a corner of its original red
Half of Lussarias Deluxe exterior gone
the walkway was colored differently right in the middle
But you don't have to do anything. I'm fine with the winter one for now, the summer with winter stuff one for later and the fall leaves one for fall Im gonna keep changing between these mods every season.