It seems to be related. It didn't stop working as Strato says afaik, but rather the post count does not include forum games posts since a while, and as Fawriel is quite active in that forum it might very well be that he has around 7k posts more than Radium there, thus making the charts appear flawed.

Link should know more about this though, so I'd wait for his answer

Edit: Fawriel has about 5000 more posts in Forum Games than Radium has. Where the other 2000 went I don't know, but probably there's some explanation for that too.