The drawer box bottom and back does not have any constraints set. This is why the cuts are going away when you reduce the width by several inches. Now, with that said, I see that your default box seems to have constraints set. So, I went and removed the box and added it back in and it then seems to be OK. Any Ideas as to the steps you took to get it in this state?? Or is there more to the story than what I am seeing here?