I saw this is also being discussed in Discord. Are you testing 1.0.1 already in alpha? I can’t reproduce this in 1.0.0, but while testing, I noticed if I move the cursor with the mouse it gets weird, and maybe it’s also related, or maybe 2 separate problems.
If I move the cursor with the mouse, gj and gk seem to remember where the cursor was before the mouse move, and moves to there instead.