The last component you just make is not on a single plane. those component you just created is at a curved surface. if You unhide the hidden geometry you will see your problem (to unhide hidden geometry go View -> Hidden Geometry) .
My suggestion is create the component that on a single plane. Remove the two windows that isn't on the plane with the door. Then place them on their place. But There is a different size of area after you place the door, so you cant just put the windows next to them.