They are auto-moving my part half a stud when I click, hold, and begin dragging the handle.
This is a regular part and this is in edit mode.
It doesn’t happen with Models, only single parts.
Notice how it jumps half a stud right as it begins dragging:
Edit: Changing the grid movement from 1 to 1/5 makes the jump smaller (so it jumps 0.1) so this means it jumps exactly half of what the current grid style is.
Edit way later: Documentation - Roblox Creator Hub
Same bug, admins got a repro and are fixing it, only difference in my own thread is that it happens with Rotate tool as well, and only happens with single parts and not models. Requesting lock. 