I agree - looks like the material shifted during embroidery. I make sure I get the fabric taut in the hoop and have little clamps I use on the frame when I do embroidery that has a high stitch count. Helps prevent the shifting. Got them at Home Depot for about 49 cents each.. They look like small clothespins. You can also try iron-on stabilizer or 505 spray w/ the stabilizer you have now.