Layer Cake Quilt Along (Block 2)

Just completed bock 2 by Vickie Eapen through the Layer Cake Quilt Along.  I mistakenly grabbed some solid brown fabric that I had in my stash and was done making the half square triangles (HST) and as I was  pressing the seams open on the last one (of course it would be the last one), I noticed the others were shrinking.  Upon closer inspection turns out that solid brown fabric was not 100% cotton, still don't know what it is.  I had to make the HSTs all over again.  I would have been finished and onto block 3 earlier today.  Oh well you live and learn.  Enjoy.