I once had a sensor showing up twice, using "auto" did not properly clear it. What did work was unplugging all sensors, press "auto" so that it sees there is nothing and wipes the slate clean, then plug all sensors back in. It should see them without needing you to press auto but you can if you feel the need. After that you may find that anything that used telemetry has to be deleted and done again, e.g. displayed telemetry boxes may have their label but no data, telemetry alarms not work, and so on.