Thank you for the reward. I have received $60 from it. But according to the leaderboard position, I should have received $70 for my rank. 'Beparanf' had posted a screenshot of the leaderboard after the end of the contest. It shows that I'm at the 7th rank. I was at the 7th rank until the leaderboard was renewed for the new round.

The $10 doesn't matter though, I would have lost it too if it was given to me . But I deserve some clarification here.