Freerice: Removed From Leaderboard???

I spent hours answering freerice questions and got to the bottom of page 1 on the leaderboard. Today when I check my account is no longer on the leaderboard even though I show the grains in my freerice account. I also see my stats in the banano group and they match my donated grains. With that said it looks like a lot of accounts are missing from the leaderboard in comparison to a couple days ago. What's going on here??? Anyone know why my account would be removed?