The invisible zipper comes in a zipper package with instructions on how to sew it into the garment. The final step given in these instructions after sewing both sides of the invisible zipper is to move the zipper bottom out of your way. Then attempt to get your presser foot lined up with the last stitch used to sew the zipper tape to seam. You then sew about an inch and then change from zipper presser foot to regular foot to complete the seam. When I do this I get a "wonky" seam sometimes and I have actually caught up part of the remaining zipper tape in the seam reguiring me to
undo stitches and restitch.
I now turn the piece around. Change from zipper foot to regular foot and sew the seam from the bottom up to the ending of the zipper stitching. It is easier to see the ending stitch and you can more easily move the remaining zipper tape out of your way as you approach it. I have eliminated the little bump at the seam end using this technique.
I then stitch down the remaining zipper tape to the seam allowances.