I think it's just a bug from CMC, currently Polkadot New is at Rank 2155. I didn't follow Polkadot but for a moment I was shocked when Polkadot was in the Top 10 position, I didn't follow Polkadot. And for Polkadot members/hodlers, hope you find success there.
The total MCAP is not yet calculated but when you were visiting another site like coingecko and you will see how much the real mcap of this coin. This coin is the same as EOS which used the total supply to make it placed at the top price.