I've only used fusible batting a couple of times in table runners--I am not a fan. I did learn not to start quilting on it right away. Let the item set for a few hours so the glue has time to really set. Did you start quilting just after fusing it? If I were you, I'd try repressing it, let it sit awhile and see what happens. Then if it still doesn't stick, get out those pins.
Be careful and check the item carefully before you start to stitch. I was smoothing mine and felt something between the layer--felt very hard and shaped like an Advil tablet. I opened the layers and it was a glob of glue. Imagine what would have happened if I'd hit that with my needle.