I was using the embroidery part of the Babylock, I had to stop in the middle of a design. when I came back to finish my design the machine made a lot of noise when stitching, it was cutting the threads underneath. I didn't realize that's what was happening at the time. This is a new to me machine, so I am still learning how this all works. When I practiced on muslin first, it came out fine. Is there something I did wrong? Something to look for?