Maybe you have a fabric that is a poly/cotton blend? I used what I thought was cotton from my stash for making churn dash blocks. Once I pressed it I realized from the smell of the fabric that it was polyester. I put one block together to see how it came out and it was off to the point it was useless. Needless to say the rest of the piece of fabric went into the trash. I would never have bought it, so it must have been given to me or part of a grab bag.