So i talked to @EvdZ|Ultimaker on the #marlin-firmware irc channel, he told me to remove the decimals to make it a whole number, the exact positioning of the probe is not critical. which somewhat makes sense and makes computations easier. and when i did this that fixed the problem.


this shoudl be your offset

 #define X_PROBE_OFFSET_FROM_EXTRUDER -51
#define Y_PROBE_OFFSET_FROM_EXTRUDER 8
#define Z_PROBE_OFFSET_FROM_EXTRUDER -10