Everybody has bad days at the range, I know I do! However, that would frustrate the heck out of me.
You have learned the lesson I did awhile back. Similar situation. Shots were all over the place and I was getting a little nervous about being on the same range with myself(lol!). Sure enough, my rear sight had shifted.
Glad you worked it out. And you got to practice point-shooting. That's always good.