How do the leaderboards work?

The site-wide Leaderboards page ranks players across every tournament, on two things: ranking points accumulated from every reported match, and bracket wins — with byes counted as wins, since they advance you the same way.

Each tournament also has its own Leaderboard tab showing that event's placements and match records as results arrive.

You appear once you have played a match. Until then the page says you are not ranked yet, which is not an error.