Timecode Recorded to Left AND Right audio tracks

Timecode seems to have somehow been embedded into BOTH channels of audio on my camera….
(example: https://vimeo.com/709338204/66f5b37bc0)

Does anyone know HOW this might have happened, any fixes, and how to prevent this happening again?

Further details for context/investigations:
– Example is a Sony a7s3 shooting 50fps
– Using a combo of new and old generation SyncE units (4 in total)
– Using the app to sync all units and stop/start TrackE recordings

– I’ve used SyncE to sync all files and export XML to Premiere

– Raw files sound the same/same problem outside of Premiere

HELP!