Using the expansion ports in apm1

HI, I am trying to add a small control joystick to apm 1 expansion ports.

but I have some problems.

I was able to put the code right and read the pots.

but I noticed that the the volt on the control pins are NOT separated, meaning that one pot changes the output of the other pot .

added a photo of it, in the photo , I only change one pot at a time !3691063216?profile=originalpot at a time !

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  • p.s. 

    I am using 0-5k resistors

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