Software Platform Calibration

[LonV]

Okay, so I understand the purpose of the platform calibration (and it's cool), but how to go about doing it perplexes me. I've done it many times and usually have no issue, but here's what I did:

I manually leveled by bed...it's pretty darned close to level across the board, but I like to get any little tweaks in with the platform calibration. So I have my nozzle at about .1mm from the bed when I go into the configuration. When I say "Set nozzle height" (and confirm) it sets that value and then immediately moves the platform up .2mm (which means it's pushing on the platform). That doesn't really work, because then I end up dragging the head around on the platform.

What am I doing wrong?