(Hope you prewashed all fabrics). I've had the same thing happen to me.
Here's what I have done to fix this problem:
Remove prior stitching on lead lines in that area.
Re apply fusible and iron it down real well.
Re sew satin stitch (by hand since it's already quilted) on lead lines wider than the first time.
It should look like it was done only once after repairs are made.
Time consuming, but an easy fix in my experience.