The most probable reason is that you are using a VPN. Admins check your IP on both forums and your minecraft account to confirm that you really own the account. Using a VPN will change your IP address which won't make it possible to determine whether you really own the account or not.
You were banned for ban evading, which means playing on another account while another one of your accounts is IP-Banned.
If this is false, you can appeal in the links given above.
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