I've bt/dt with a rifle that had been knocked off of zero..
Had same this past Jan.... wife was on me for bad shooting, but after the 3rd shot I told her the rifle has to be about close to 10 inches left for some reason....
Shot it on target... 8 inches left.
Stuff happens.
Had it many years ago... gut shot a cull buck.... second shot, guts again while my wife is spotting... so third I hold OFF the deer the correct direction and dump him.... that was a SOB at our ranch guiding that was pissed off at me and moved my scope but I digress