It is not your quilt top....from your placemat photo. You can tell that your fabrics for the top did not shrink hardly at all, due to the puckering. The batting looks to have shrunk. Did you use the same muslin on the quilt? If not, then it is definitely your batting. BTW your quilt is beautiful! I use muslin in quilted jackets that contain no batting...I prewash the Batiks but not the muslin...on purpose. I quilt the batik to the muslin, then wash in hot water and dry on hot to get the quilted look without the bulk of batting. (I live in Texas) the muslin shrinks the batik to look as though it is quilted with batting. However, in your photo, it does look like the batting has shrunk. Interesting that the paper states clearly on the front "no prewashing required". Really? I would test that batting with two quilt fabrics to see if it is the batting....then never buy it again.