Oh man, you kiddin? I miss deer just about every year with my bow. Its one reason I hunt with the thing.
Thirty yds huh? I'm betting that deer "jumped the string". He heard your shot, and before the arrow got there, he dropped and pivoted and was gone. Slo-mo has proved an alert deer can do this. Easy. They don't dodge the arrow, they react to the sound. Also, I believe a deer past 20 yds that is looking at you when you shoot, can startle and react to the flash of the bow limbs snapping forward.
Thirty is about my limit with a bow. Half that is better, much better.
And, I'd rather have a clean miss any day. A badhit/lost deer is the WORST thing that can happen.