switch traffic twice as high as cpanel traffic

As you understand the traffic of the server is twice as high of what cpanel says..... I know cpanel only has ftp, http and mail stats but that is 70 GB and outside this there's used another 70 GB switch traffic twice as high as cpanel traffic does anybody know what this can be? I've been searching already but can't find any strange things (only 2 persons have root access and those are from the company).... Anybody knows something to look what is the cause of this traffic?

 

 

 

 

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