I learned a trick in home Economics that may help. This usually takes two people. Each of you gently grab the opposite corners with one hand (both use left hands) and gently pull against each other, then you grab next to your hand, with the other hand moving to the right. (each of you moves to your own right.) Gently pull again. Move hand over hand, until you reach the other person's starting point. Measure again. What you are doing is re-aligning the threads to make it square. You can repeat the process until you get a square measurement. Once you get a square, press with spray sizing to keep it square until the project is finished. I press and use the spray sizing a couple times to lock everything into it's new position, before I do any folding, trimming, or sewing. I have used it a couple times on pricier fabrics that were wonky, so my money wasn't wasted. I hope this fixes it for you. :thumbup: