A few situations can trigger another person's Garmin data uploading to your Strava account. One is if you borrow a friend's Garmin or acquire a used Garmin; the device's activity history can be synced to your Strava account when you use the Garmin Connect app to upload wirelessly. In this event, proceed with submitting a support ticket for assistance in bulk deleting the history from your Strava account. It's also possible that Garmin Connect authorizes the wrong Strava account. If you find activity on your Strava account that is not your own, navigate to your settings, disconnect Garmin, and delete the activity. If desired, reconnect to your Garmin Connect account.
If Multiple Users Upload With Garmin Express on the Same Computer
Make sure each device is linked to the correct Garmin Connect account. This keeps your activities from uploading to the wrong account.
To change the account linked to your device:
Open Garmin Express.
Select your device.
Select Tools & Content > Change Account.
