This is really simple to reproduce.
I have a set of three linked notes. I press Ctrl-F, type in something common and press the “find next” button - with repeated presses the cursor jumps forward through the occurrences of the target and then wraps round to the first one.
So now I click on “Find previous” and exactly the same thing happens. The cursor jumps forward until it wraps around. I suspect a really simple piece of misplaced code but it would be nice to have it fixed!