I was shooting a bow that I finished a few months ago tonight and shooting about like I always do, all over the place.

This bow has Mickey Lotz' floppy arrow rest on it. Just for fun i flipped it upside down and shot it off of my hand. Wow! Alot more accurate. It went from spread over a square hay bale to about the size of a dinner plate. This is shooting at 15 and 20 yards. My question is what would cause the difference? The tiller of the bow, the arrow rest or am I just imagining this and I became Robin Hood in 5 minutes.
Thanks
Shane