I just noticed that the Badges page shows that many were just awarded to Diego:
If I check his profile it shows a very long list of recently awarded tag badges. While I am very happy for him (I would award all of them to him :-D), I think that he already had many of them, probably all of them.
I browsed through the Bronze tag badges page and found out that it is happening to other users as well:
Why is this happening? I don't see any pattern other than the two main users of the site plus a few random.