I have this same problem on one I am working on right now. Its very frustrating. I did the glue basiting for some reason it is not working very well on this quilt. (this quilt is cursed - painters tape won't stick to it either) I picked the quilting out on 1 fold and was able to requilt and took care of it. There are 2 others that I am going to get the seam ripper and try to fix those tonight... its a solid backing and it really shows Good luck!