Backings are funny. Sometimes when loading you don't realize there is fullness in the bakcing. Once you are finished, the fullness becomes obvious.
I have a quick and easy way to eliminate that fullness and you for sure want to correct it before you proceed! Fullness in the backing can cause a please in the back of your quilt. The greater the fullness, the larger the pleat and that can be disastrous!
All you have to do is reverse roll it to get the fullness out as you will see in the video below!