You have to take the bed-size and the probe offset into the calculation of the bed_mesh.
Bed X-max is 200
The probe X-offset is -46
Bed X-mesh goes from 5 to 215
So the X-probe-positions go from 51 to 261.
That is way off the bed (208 already is).
For further information: Understanding X and Y Axes Limits and Homing