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.
I just heard about polkadot a week ago and in my opinion it's not fair to have reached the top 10 of coinmarketcap, after I checked it was still in position 2155, that's still far. But slowly polkadot will enter the top 100 of coinmarketcap because there are already many large exchanges that support daily volume.