You seem to have copied Configuration.h from the example_configuration folder?
This did not work for me, the default Configuration.h is newer and worked better!
You have selected MOTHERBOARD 34 in Configuration.h,
in pins.h I see MIN endstops defines in the RAMPS section:
Line 444: X_MIN_PIN = 3
Line 450: Y_MIN_PIN = 14
Line 456: Z_MIN_PIN = 18
Those three lines should probably be set to -1
This did not work for me, the default Configuration.h is newer and worked better!
You have selected MOTHERBOARD 34 in Configuration.h,
in pins.h I see MIN endstops defines in the RAMPS section:
Line 444: X_MIN_PIN = 3
Line 450: Y_MIN_PIN = 14
Line 456: Z_MIN_PIN = 18
Those three lines should probably be set to -1