Edit: This seems to be a network-wide issue. See: Meta Stackexchange
A few minutes ago a got a notification that I received an Excavator badge. This was kinda puzzling, because I already had one. Shortly after I received yet another one, which made me open the acoording badge page. It appears that this badge is awarded repeatedly to random users.
This goes on for 12 pages. Some people are also getting Marshal badges.