Scope issues with elevation knob or I'm juste dumb ?

Corfius

Private
Minuteman
Jun 22, 2021
47
29
Canada
Hi,

So I zeroed my Bushnell DMR II at 100 yards. I set up my zero stop.

Then I wanted to test how much elevation I had left so looking at the reticule I start cranking up the elevation.

I had 22.4 mils left but only 20 mils of usuable elevation. The last 2.4 mils the turret is clicking but the crosshairs is not moving at all.

Same thing when I start moving down from 22.4 mils to 20 mils then it's ok from 20 to 0.

Scope issues or it is expected ? Am I doing something wrong ? I never noticed something like that.

Thanks