First time builder here, working on a WD 10. I stitched the bottom and side panels to the forms, and to each other. The bottom and side panels are tight, but the side panels are overlapping the bottom panels where they meet. I followed the bevel plan, but the panels don't seem to want to stay together at the seam (between bottom and side). It's almost as if the bottom panel is being pulled in. The overlap is pretty much consistent on both sides.
Any ideas on how to fix this? See pics below. Thanks in advance for help/advice.