I am seeing several ( 100 + ) activities in my activity log. Not sure why this is. I am not sure about just deleting them since I may be stepping on someone else's activities. All I can think of is that I have a common profile name with at least one other person. One other thing that is interesting is that the activities are from a user that lives relatively near me. About 25 miles away from what I can tell he has a large number of runs that start and finish in the same location in Maynard, MA. Any ideas?
That would be a serious issue, getting someone else's activities in your Connect account. Can't think of any plausible explanation. Best call Garmin Support about this.
Apart from the question whether or not the OP should approach the other person, Garmin really has to be notified. It may be a weird one-time fluke, or a silly cause like selling an old PC with Express plus GC credentials still on it, but there can also be a serious issue with security of people's data which Garmin needs to investigate.