I have a problem with the wallpaper of this one specific room. I keep noticing that it appears to have the wallpaper of another room in that house, but if I just hover over the wall in build mode with another wallpaper selected, it corrects itself. The room actually had different wallpapers on different walls but only two of them kept switching (the wrong wallpaper appeared on two of the four walls). I tried changing the wallpapers but the same thing happened. I kind of got tired of caring, so I just left it, but it would be nice to fix it if someone knows how...
Try if deleting the cache files helps: http://sims4.crinrict.com/en/2014/09/delete-cache-files/
I don't work or have any association with EA. I give advice to the best of my knowledge and cannot be held responsible for any damage done to your computer/game.
Please only contact me via PM when asked to do so.