Hi guys! I'm new to the forum and excited to be here. I've been trying to fix this for 2 days now. I am stitching felt onto 7 oz veg tan. I can get a beautiful straight stitch. For the backstitch only, I get the top thread looping at the bottom. Attached are images of what I mean, as well as an image of the machine I'm using (Highlead/Artisan 2698-1). I've tried adjusting the tension, changing the needle and different thread thicknesses. I thread the needle with the foot up. I've tested it about 100 times and if I wanted to do this, I'm now confident I could do it every time. Its the same result with every thread combination. But I don't want to do it this way, so any help would be appreciated.