That's not unusual and will occur if your scope mounting is on the piss and you've used almost all your windage to correct. When the elevation is adjusted it will reach a limit sooner. Instead of being able to adjust to 12 o'clock in the circle the erector tube will hit its upper limit at say, 10 o'clock. And as you say adjusting the other dial (moved in the correct direction) returns some of the other dial's adjustment.
I had it happen on an old Leupold. I had used quite a bit of windage to line things up vertically at 100yds. I then went to a shoot at 400 yards. My shots were low so I cranked up. My elevation ran out but just before I ran out my shots as well as going higher as I'd hoped went sideways as well, without touching the windage. At the time I couldn't work out why the shots went sideways when adjusting the elevation and why I had run out of elevation earlier than expected.
That's why its important to find your scopes optical centre before mounting and if you have windage in your mounts, use the windage adjustment to get somewhere near to vertical. Fine tune using the scopes windage turret.
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