Carrot, I had the same experience, was so disappointed!! SOO rather that ripping at the time, I just cut out new pcs and made another one and IT turned out same way!!! So, that's how it'll stay! I thot maybe I'd miscut on the first one, but very carefully checked the next batch, turned out same way... I did take apart the other one, can use the pcs another time. I even tried wetting the block and carefully stretching it as I pressed...it helped a tinsy bit.
Happy, just get done what you can - maybe just one block. ;o)