Thanks everyone, I've ended up with a few "L" shaped pins. I need to either start squaring up after each step or pull them out right before I sew over them. For you talented quilters how do you not pin and end up with nice seams?
This is part of my D9P. It doens't lay completely flat (and I believe it is because i'm stretching my blocks when I iron). I pin it to death and still it ends up "wonky" (haha. learned that word on this board).