We forgot to take into account the network problems we had on October 2 when we generated the leader board and certificates so we intend to regenerate these sometime today.
Remember also that the leaderboard is the overall leaderboard whilst the certificates tell you how you performed in the individual challenges.
Your performance in challenges 1 & 2 will not count towards the overall leaderboard positions so next week (after challenge 3) the board will be generated from scratch.
Harry