I started sewing together a charm pack to make a purse I got the outside all sewn together and started sewing the inside together when all of a sudden the sewing machine started making a horrible banging noise and the back of the fabric where the stitches go looked almost like a big old eyebrow. I tried rethreading it tried the tension and nothing seems to be working. There are a few stitches on the front of the fabric and a big eye brow looking thing on the back again. Please do any of you know what the banging and the eyebrow stitches could be caused by and how to fix it?