All I can think is maybe I was flinching or blinking. Hard to remember what happened in the heat of the moment.
I would say that right there was/is the problem "heat of the moment"
I encountered the same problem about 20 years ago. I got all heated up at the appearance of the animal. I started "throwing" my shots at them. when I had missed my 4th deer, I sat down and really had a talk with my self. I made a conscious effort to become icy calm after that. I imagined I was operating on a brain. cold, calm, precise. shoot like you are trying to hit one hair. worked for me. about 60 or so critters later and a equal number of rounds.