Will someone please explain me how is the ranking system working?
Unfortunately the ranking system is currently broken. If used to list the languages by score and solved, and also ranked each solver by their scores and showed what they'd solved etc. I believe Piotr Kąkol has been looking in to why it's stopped working. I did prod him about this a while back.
I like it.
ow are language SCORE and POS calculated in the ranks?
POS is user's/language's position in the ranking. When 2+ users/languages have the same score, their POS is the same.
And score is the sum of points in each row.