NI 6030e ctr 0 out and ctr1 interference

Hi,

    I am using a NI 6030e connected to SCB-68.

    And use CTR1 out and CTR0 out to generate pulse train to control step motor.

    But I found that if CTR1 or CTR0 is generating pulse train, at the beginning of the pulse, the other channel will have a voltage rise too as shown in the image. 

     any way to solve this issue?

     thank you very much!