The Roof shingles are not applying correctly becasue the Perspective on the layer is most likely wrong. Read about the Perspective tool, also learn when to use the Perspective tool here. Your shingles won’t apply correctly until you fix or set the right perspective. To access the tool for that layer go to the “Draw” tab and click on the layer that the shingles don’t look correct. When you click on the layer, a new set of options will appear on your left and one of them should be ‘Set Perspective’