I have a kind of unusual one that I found out about kind of by accident.
I recently had cataract surgery in my left eye, which turned out great. For the first time in my life, I have good vision out of my left eye. It not only took care of the cataract, but near-sightedness and astigmatism too.
Now I'm in the in-between period waiting for my right eye to be done. Shooting is somewhat difficult, as I am wearing glasses with my old lens on the right side, and no lens on the left side. This makes it really obvious which eye I'm looking out of.
I'm right eye dominant, and have found that a good part of the time, I turn my head in enough that my right eye is blocked by my nose, and I'm really seeing the target with my left eye only! This is something I've never been aware of before. But I assume that if part of the time I have been shooting using my right eye, and part of the time with my left eye, without knowing that I'm switching, it could well be a cause of some mysterious misses.
You might want to check this for yourself. If you already wear glasses, just tape up the left side (if you're right eye dominant), and shoot normally, and you can see if you've been fooling yourself, like I was. If you don't wear glasses, you could do the same thing with dark glasses or shooting glasses.