I'm not and I suggest you to create a comparison between CMC and another marketcap site like coingecko, cryptorank, or cryptocompare and you will get the different result.
I believe what has already published by CMC seems already manipulated.

It's very easy to know that. CMC itself is manipulating the total volume on its own site. When you are using another site and those exchange sites will have less volume than what has already published by CMC. The problem is on the CMC itself.