11, but not really!

I finished 3 blocks this morning.  Two were spot on at 9 1/2 x 9 1/2, then I hung the 3rd one.  It measures 9x9.  How could that be?  Well, I did not reset the needle position so my seams are all larger.  How could I have missed it?  It was going together so nicely, that I was kind of lost in oblivion.  Fortunately there were enough leftovers for me to cut out another one to be sewn later today.  Love my new Bernina 440QE but have not learned to a flight check before take off.  (Wait, maybe I have at this point!)  May frame this one to remind me to always do a pre-flight check.  lol