It looks like the roof edges at the hips are not vertical, causing the corners to stick out. If you cut a section at the hip you will probably find a void where the roofs overlap.
To fix: Select both roofs. Click the edge and select the pet palette option for the angle. This will give the option to miter or make vertical. I usually choose the vertical option since they will then stay that way. If you miter them they are also set to vertical but as a custom angle which is retained even if the roof slope changes.
Rubia Torres
