Shoemint, black leather ankle boots, size 6

Shoemint, black leather ankle boots, size 6. These have cute buckles and fun cutouts. The zippers are on the back, but I noticed that when I tried to zip up the left boot, I kept struggling and it would get stuck like on the last picture. I tried them on and was able to pull the zipper all the way up though, but it continues to get stuck. I have priced them accordingly due to this issue. Please let me know if you have any questions and thanks for looking!