Pixhawk 2.4.8 Channel Issue

Hi everyone!
Thanks for reading this.
I’m creating a product for my school, and I’m using the Pixhawk 2.4.8 flight controller board. I have Mission Planner and I have used it to calibrate the accelerometer and a few other things.
My problem is that all the channels, such as pitch, yaw, etc are working properly and I’m getting feedback from Mission Planner showing the inputs from my transmitter. However only channel 1 is not working. I am using a FlySky 10 channel Rx and the PPM encoder that came in the HobbyPower S550 kit.
One thing I noticed is that channel 1 shares a plug with the positive and ground ports. Not sure if that means anything, but it’s an observation.
Does anyone know about this issue?
Thanks everyone for your time!
-Lucas C

You’re using MissionPlanner and therefore ArduPilot. I would ask over at their forums: discuss.ardupilot.org.

Okay, will do. Thanks for the advice!