Ooh I agree that's tension and because of the long stitches it shouldn't take too long to remove but boy I know how frustrating that can be...been there and done that! ;) I have a little square from a practice sandwich I made that I keep by my sewing machine whenever I'm free motioning...just like I might check my tension for piecing evertime I start I will do a little practice squiggle on my scrap square just to make sure tension and everything is looking good. Gives me a little warm up too before I get started on my actual project. Good luck! ;)