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DRV8251AEVM: BDC motor shaking when driven with DRV8251A

Part Number: DRV8251AEVM
Other Parts Discussed in Thread: DRV8251A

Hi,

We are testing the DRV8251A on a brushed DC motor (24V 4A). The development board has two potentiometer to set the motor speed in both directions. 

Our problem is; the motor is turning but heavily shaking. It looks like an overcurrent, but the current is very low (the motor is spinning in free air). 

We are using a regular brushed motor. 

Only if i set the speed to 100% (IN1=HIGH, IN2=LOW) the motor spins fast without shaking.

What could be the problem here?