Hello ​@Frankster67 - thanks for writing in. The first possibility is that the wrong Garmin Connect account may have gotten linked to your Strava account when you set up automatic syncing. To correct this you'll need to disconnect and reconnect your accounts.

Here is how:

1. On the website: Strava.com > Navigate to your Settings and locate your 'Social Connections'
2. Under 'Social Connections,' locate the Garmin connection and click 'Disconnect'
3. On Garmin Connect > Navigate to the head icon profile photo (left-hand side) > Select 'Settings'
4. Select Account Information > Scroll to bottom
5. After you disconnect the accounts, go ahead and reconnect by following these instructions: Uploading from Garmin Device

The second possibility is that the wrong Garmin Connect account may have gotten linked to that device when it was first connected with Garmin Express. To check which Garmin Connect account is associated with that device, please follow Strava Support Garmin Data on Someone Else's Account

1. Open Garmin Express.
2. Select a device from the drop-down on the upper left.
3. Click "Device" on the upper right.
4. Scroll to the bottom of the page and look for "Garmin Connect Account".
5. Change account, if necessary

The last possibility (if you recently sold, purchased, or returned/received an old device), this device may still be connected to your account. Here are directions from Garmin in regards to remove or retire an old device: https://support.garmin.com

In regards to the automatic uploads from this device, our Support team do have the ability to bulk delete these uploads. If you do not currently have an open support ticket here’s how to submit one. If you have trouble with our online form, you can send an email to support@strava.zendesk.com.