Are the puckers in the border or in the part of the quilt onto which the border is sewn? It it's in the border, the border may be a little too long. I carefully measure both sides and the middle of my quilt, add those measurements and divide by 3 to get the appropriate length to cut the borders. Example: Left Side - 60" Right Side - 61" Middle - 59.5" Add all three numbers (180.5), divide by 3 (60.1), so the border should be cut 60". I didn't know to do this on the first quilt I made, cut a long border and sewed it onto the quilt. It was very wavy and had puckers.