I do have to do this at least once a week. They are always called untitled and are most of the time from australia. I've never been there. I'm from germany. :confused:
The attached screenshot shows one of them:

The direct link to the faulty workout, which is not mine is:
http://connect.garmin.com/activity/110417733
Garmin Support: Please look into this issue, since I believe, when I delete that workout, somebody on the other side of the globe might get upset!?