Z Probe large XY offsets

[JoeBone]

All,

I have a Cartesian printer where my probe is 121mm behind T0 and 11mm to the right of T0.

I placed this into my config: G31 P100 X11 Y122 Z1.255
This all makes sense to me, but in my bed.g I have to start my probe on Y at 125mm for it to work because of the large offset.

; define probe area
M557 X50:900 Y125:850 S75

When I run mesh bed leveling this puts the nozzle at X39 and Y3 on the first point.

My questions / confusion is, will the heightmap compensate for where my nozzle is during probing or where the probe is?
I hope that makes sense.

thank you!