RE: How many of you have had this happen?
I had a bad hit this year. I'm not sure what exactly happened. I think the edge of the broadhead deflected off her shoulder. The deer was directly broadside and the entrance wound was perfect but the exit wound was way back. I found little acorn piece in the blood. She only ran about 20 yards and bedded down. I thought she was dead, so I got up close to her. When I realized she was alive I gave her another shot which did the job. Sometimes freaky things happen. You just have to find her! I thought I heard that especially w/ gut shots that they don't go far if you don't push them. I got lucky.
My new toy this year is a gps. I'm thinking the plotting feature (all gps's have) will work great for finding deer. It will help my be able to check every little nook and cranny.