Ok, so I just bought a brand new pair of field boots on eBay. They are the kind that have the zippers on the back. I've had my foot measured and have tried on several different brands of tall boots, and have been a 7.5 in all of them. When I got my new boots in the mail today, I instantly had to try them on just to make sure...but the zipper wouldn't go up all the way! It was physically impossible and I tried more than once. Does this mean they are somehow the wrong size for me? Or is this a new boot thing that can be fixed? PLEASE help. Unfortunately I don't think the seller accepts returns...is there something I'm missing?