Many spurious activities continue to be sent by the Garmin Service that connectstats currently uses.
I will likely be able to push a fix for this during the weekend. The good news I anticipate the app will be able to delete all the spurious activities that are sent from the Garmin API.
Garmin is also now providing a new service, which I am working on integrating and will avoid all the Garmin API issues in the future, but this takes time.