Sometimes, when I’m typing, my cursor will jump up a couple lines of text. This only happens when I’m typing, and only occasionally. I haven’t been able to determine any patterns beyond the typing.
Are you on a laptop? SIlly answer, but sometimes this happens to me if I accidentally brush the trackpad.
Actually I have seen this too, and I am on a desktop PC. It is not just when I type, but sometimes when I try to position the cursor, it jumps after I have set it. Just a minor thing 