Switched computers because Garmin express did not work on my main computer. When I moved to a laptop, express began to work, but the process of connecting required the creation of a duplicate device, which properly synced. Garmin connect then had the new activities, but also picked up duplicate activities from activities that were not deleted on the device after syncing. Attempt to delete the activities on Connect sometime worked, but sometimes show error message, and does not delete. Not sure how to remove these activities at this point, given the function on the web site does not work. Not sure if deleting the deleting the device will help the dashboard.
Did garmin consider how one uses more than one browser/computer with website?
My guess is no, from how this is working.