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DRV8889-Q1EVM: Significant periodic clutter

Part Number: DRV8889-Q1EVM
Other Parts Discussed in Thread: DRV8889-Q1

hi team,

customer use our EVM, Test with a 12V 120 ohm motor.

GUI configuration is as follows: 

The measured waveforms are as follows, with significant periodic clutter that cannot be removed regardless of the adjustment of attenuation. And the noise of Ifs=40mA is greater than the noise of Ifs=70mA. 

(1) What is the reason for this?
(2) How to remove?