Some aircraft use dual transponders. I believe that is what you are seeing. Lurking planefag here.
https://www.foxnews.com/us/2018/08/13/flight-data-recorder-human-remains-found-in-stolen-sea-tac-plane-probe.html
Some aircraft use dual transponders. I believe that is what you are seeing. Lurking planefag here.
https://www.foxnews.com/us/2018/08/13/flight-data-recorder-human-remains-found-in-stolen-sea-tac-plane-probe.html