[Sunstroke]

Hmm... The PIDSubsystem doesn't do much behind the scenes, it just kind of takes your input and spits back an output.

It seems more likely to me that you have maybe created an arm somewhere else as well or maybe two PIDArms? Maybe you didn't get rid of all the references to Arm in the code when you stuck in PIDArm...

That would be where I first look for the problem.