I discovered that even tho I pinned carefully and matched the seams, the bottom seam allowance would flip the wrong direction because of the slightly raised edge of the machine. I have it in a cabinet and cant adjust so the edge of the arm of the machine is flush with the edge of the table. So I cut and piece of plastic and taped it so this area will be flat and smooth. This helped. Then I discovered that after I pin I will take a long pin and pin through all layers parallel to the edge to be sure the bottom seams are laying flat. Hope this makes sense.