Joe, my best hunting buddy and i have shot thru the double bull netting with 3 blade snuffers, wensel woodsmans, and 2 blade magnus stingers without problem. Our netting is pulled fairly tight...don't know if that could have caused a problem. Did you try shooting another arrow thru the netting after? Sorry i'm not a lot of help, but unless it glanced off the side of the window or the netting was extra loose, i don't know why it would have deflected. Maybe someone else will jump in.