I am trying to use stitch #3 (zigzag) to sew around some applique. I have the stitch width set on 5.5, the stitch length on 0.5, and the tension on 2.5 and the pressure foot 2. The problem is that it is forming a tunnel or indentation underneath the stitches. Is that normal or am I doing something wrong? I am trying to make the Sweatshirt Jacket that UnglyCook put in the Tutorials sometime ago.