This is why it is important to follow the quilting distance recommendation on the batting package. If there is too much distance between quilting lines the batting will separate and pull apart. If a quilt is going to be tied it is necessary to choose a batting that states on the package that it is OK for tied quilts- not all battings are good for tied. This happens with cotton battings too ( often faster than polyester) if your batting says to quilt every 2" - 4" more is better. Always consider the recommendation to be the minimum.