If you don't like a specific site, don't use it. There are plenty of other market cap sites doing things differently, so try that, or start your own site and do it the 'right' way.
People have been hyping up these market cap sites as if they represent any sort of importance in terms of coins being listed in the top 20. These lists are garbage with how shitcoins such as XRP have a giant market cap due to the insane number of tokens in circulation.
I like
https://coinmarketbook.cc/ because it ranks coins based on their buy support.
1 - Bitcoin $282 million.
2 - Ethereum $40 million.
3 - EOS $14 million.
4 - XRP $13.5 million.
5 - Litecoin $10 million.
That's a completely different picture. Not saying it's not subject to manipulation, but this at least shows more strength as metric.