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Abnormal duty cycle value

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lacondro
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Abnormal duty cycle value

Hi, I am now building a custom hardware based on 75_300_R3.

I'm very new to electronics design, so I have been struggling.

The problem now is duty cycle value looks very weird. 

 It seems oscillating when do nothing(no input, motor not running), and when I turn motor in one direction by hand I get strange value.

duty floating.png

 

It should be like this↓

original.png

 

It would be grateful if anyone can give me any suggestions where to check.

 

Thanks you.