@Black-Square I'm sure you have, since as you mentioned this comes up at least once per aircraft. I thought perhaps using an axis was overlooked because without it being motorized, it's honestly kind of a pain to use sometimes (because of how out of sync it can get).
That's the thing about optical illusions, they're so fickle depending on how you're focused on them, I just didn't think one click at a time could cause it. I'll keep an eye on it and maybe try to capture a video if it persists. It wasn't happening consistently, which also points to it being an illusion I suppose.