Only Channel 1 is Responding

Hi, I am trying to individually check all the motors to our drone. We are using a pixhawk autopilot Pro and using QGround Control v3.3.2 When using the PWM test commands, only channel 1 is responding. At first, I thought it was a hardware problem so I plugged each rotor into channel 1 and they all responded, so I know its a software problem. Does anyone have any idea what could be causing this or any solutions to this problem? Thank You, anything will be helpful

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