Is this what you used???
http://www.hancocks-paducah.com/SHOP...-Quilt-Batting
This is their polyester batting. Polyester batting can migrate more than the 80/20 cotton batting with scrim. I had the same thing happen to me with a black dominant quilt 25 years ago. That is when I made the permanent switch to cotton batting with scrim. I donated the rest of this polyester batting to a church group.