have any of you bought pre-cut kalaidescope blocks from e-bay. I bought several sets. I had bought 2 sets of 6, 7"blocks of beautiful black and white fabric but of the 12 blocks, only 1 block turned out. I put the rest together but 3 of the blocks are really off. It looks like one of the fabric layers slipped about a 1/4 " Has anyone had this problem. Lylamarie