First of all Welcome to the QB from SE Michigan! I am sure there will be a great deal of response to this problem as this happens for a variety of reasons. I had this happen about a year ago on a baby quilt I made. Nothing like being frustrated! I had to remake the quilt using different fabrics. I too purchased the fabric from the same place you did. It was my first order from them. I knew that my seams were even 1/4" because narrower seams can cause this to happen too. Fabric quality is a bigger problem than the seams. I would strongly suggest pre-washing fabrics from this company maybe this will help too. Sorry this happened to you. Again welcome to the QB.