onigoroshi: You are even newer than the game of Go :)
Go was introduced very recently so not many players have a rating yet. Just play 25 rated games and you have a rating, but only 4 to get yourself a provisional rating.
The 3 variant (9x9, 13x13, 19x19) are considered different games, so when you have a rating in one of them you don't necessarily have a rating in the other two.
(kaŝi) Se vi ne volas ke aliaj uzantoj scius kion vi faras, tiukaze vi povas ŝalti kaŝitan statuson en Agordoj (nur pagantaj membroj). (pauloaguia) (Montri ĉiujn konsilojn)