Wondering if anyone else has experienced this problem. I found a huge pile of gorgeous batik strips at a quilter's estate sale. Maybe drooling on them caused the problem. Anyway, I put them into strips of three. Everything was evenly cut. My seams were all exactly 1/4". I ironed. Then using a ruler I cut them into perfect triangles so I could make a square. The seams matched up perfectly BUT it's all puckery. There's a big POOF in one corner!
I've ripped a couple apart and tried again, but still POOF. Not sure what to do since I think they will all end up like this. My only thought is that I will iron them down as flat as possible and quilt the heck out of them, but at this point I am one sad quilter.