I did not grab the patch yet, but I know in previous building sessions, what I though was a room turned out to not be a room. It might cause the ceiling issue above. I normally fixed that bu clicking on the floor to see the room borders, then either adjust/move the "invisible" walls, or delete that room and add a new room. I often struggled with this when we got the module stairs. Might be more tricky when the room/house is already equipped, but replacing the room should fix most ceiling problem if there is no easier way.