I found the "User Leagues" for the first time and decided to check my score for the year. I was surprised to see that my rank had apparently decreased by 10242 year-over-year.
(I used to be 30th?? - awesome!)
I've only been a member for 16 days, and this looked a little strange, so I thought I'd read about the User Leagues rankings on Meta Stack Overflow. When I linked through to the User Leagues a 2nd time (in another tab), I found that my rank now showed and wihh an increase of 18616.
Has anyone else seen this? Is this a bug or is this common for newer users, and I missed the explanation elsewhere?