I was going to agree with the last post I just got done with a quilt and I had to rip if i wasnt paying close attention. Finger press open before u cut to test each block to insure they are matching up. I hope that helps but just know many of us have been there!! Also, that line you draw has to be fussy from one corner to the other if its even 1/16 off your stitching line will be too...again I had to fix that on a couple to...mine was supposed to be kid friendly so my youngest monster was helping we both learned!!