What you are missing : you are measuring amp battery not amp motor
Really short cut but :
2a at 25v = 50w at the battery
If you motor is slowing down at 360rpm for exemple it uses only 2,5v so 50w/ 2,5v = 20a at least
Try to slow down the motor as you increase throttle , batt amp should increase
59A is a given number standing but mechanical torque capacity before motor start to surfer , it should be available really soon even at low rpm