When I repeatedly drag an image from side to side in the Development module zoomed in at 100%, image sometimes kind of jumps back as if my mouse was suddenly moved back. This doesn't happen if I move a box in the Navigator window, and this started after the last update.
Updates for the Adobe Photography Products were released on 10.20.2020 that include fixes for these issues. Please install the most recent update and confirm that your issue is now fixed. Please let us know if you encounter any issues.