@AlexHorton95 I agree with
@DonroaAkashu , Try re-drawing the walls of the room having the problem. You may lose the wallpaper/paint but it sounds like it's not fully enclosed. This can happen on some of the more... non-standard... room designs.
If you want to see if it's just that room or a bug in your game, try drawing a new room in the back yard or somewhere. Make it a normal square and see if the wall patterns work properly there. If it works in the new room but not the old one, then you'll have to recreate the room or figure out where the walls aren't properly joined.
