I bought an used Fenix 6 watch on 2020.01.07. The seller disconnected the watch from his profile. After the purchase I connected my watch to my profile, and I discovered in Garmin Connect Web, that I see the seller's all previous activities, Please check, what can be wrong.
You can check the activities concerned in my profile: all activities before 2020.01.17, which are connected to a Fenix 6 (Vivoactive 3 was my previous watch.)
PS: Sorry to open a new topic for this, but I tried to contact to you 2 times through chat, which is stuck at "Retrieve config", and I didn't found email option.