If you are seeing duplicate workouts, that means something has gone wrong during the syncing from TritonWear Live. This was most likely caused by a poor internet connection. In that situation, the app tried syncing the workout, but never received a confirmation from the cloud once the sync was complete. Later, the app attempted the sync again — creating multiple workouts for an individual swimmer.
In the event a duplicate workout was created, if you are a coach you can delete the workout on TritonWear Insights.