why s my roof showing in the house??

yes the ceiling is there, but thanks for that info cause sometimes the ceiling did get deleted before and i just had to delete the room and remake the room so it would go there, so that helps a lot. what i ended up havig to do last night is resize the roofs that were showing through, the ones that were showing through were from the floor below, so i made them slightly smaller and now they are gone. when i see videos on youtube they make it look so easy. move the roof until it hides into the main roof so it will look good, and it never showes through inside. goess i still got a lot of learning to do.