I have two of the radio panels, before switching to FSX 2020, i was using p3dv4, and everything was working perfectly.
Now with fsx 2020, and after downloading the latest logitech plugin, I have problem. when I dial one of the radio panel, both radio’s dial numbers move, I am not able to get each radio panel to act separately.
Didn’t a recent patch integrate the Logitech drivers? Try removing the Logitech drivers you just installed. This sounds like an issue I had with X-Plane once, where I had two sets of drivers installed, Logitech & SPAD, and it duplicated inputs i.e. one rotary click became two.