Yesterday I was awarded a whole bunch of tag-badges. However, I already held them all. It seems that I have been re-awarded all of my tag-badges for some reason, but, from what I can see, noone else has had this issue. I am wondering what has happened here?
For example, I have had the gold badge on the group-theory tag for ages. However, I was awarded this badge yesterday and, apparently, this was for the first time (see here). At the same time, I also won the silver and bronze levels of this badge! Also, none of the other people with this gold badge were awarded it yesterday, so I presume this issue is local to me.