Cold extrusion prevention seems to catch almost everyone off-guard.

I hadn't noticed before (I don't use the LCD controls much), but yeah the number of detents in the knob to move through the UI does seem inconsistent (or perhaps consistently following an unusual pattern.) And I also have 2mm movements through the Move Axis menu. If there is something wrong with your machine then it looks like it is also wrong with mine, but as I said, I don't use the LCD much and it hasn't affected printing so I don't much care.