It's not basted tight enough; has puckers in it already, even before the quilting. Tape your back down taut before you baste. And spray basting is a sure-fire way to keep it un-puckered. It's a spray adhesive that I, and so many people, LOVE. You can buy a brand at Joann's/Hobby Lobby/Hancock's that will do. Follow the can instructions. It's also easier on your back.