First time I had hunted from a treestand. It was a canoe-in trip to a swamp on the edge of a remote lake in the Adirondack foothills and I was using a 55# Damon Howatt Dream Catcher. My arrows were 30-1/2" BOP P.O.cedar with 135 gr Zephyr Sasquatch II broadheads (big, wide beggars).
I had a nice eight-point buck walk almost directly under me; passed from behind to right under my stand. I was worried he was about to pass over my trail I used to get in (downwind) an hour earlier and scent me, so I took a shot down into him between the shoulder blades. He dropped like a rock. I waited a minute and tied my bow on the cord to lower it, and just as I started to he wobbled to his feet and ran off. I could see the upper half of my yellow crested & fletched arrow up above his back. Less than a foot penetration.
I spent all the rest of that day and the next two days or the trip poking through a hemlock swamp in knee to waist deep water looking under hummocks for a dead buck. Never found the buck or any part of the arrow. Just one good pool of blood and then nothing.
It was 12 years before I went up in a treestand again and thereafter I switched to narrow broadheads. Additionally, I will take a second shot if a deer is within range (has only happened once since then that a deer dropped immediately - a heart shot - and I put a second arrow through the lungs). I also avoid steep angle snots. Passed on a nice eight-point this year that did the same thing. I could have dropped my bow straight down onto him and he walked off without turning to either side.
I really can't blame the broadhead, but I was so disgusted I had no confidence in them after that.