Below article will describe the steps on how to fix the cPanel Error “IP Address Has Changed!” 

There are two possibilities why you would receive an error message “IP address has changed” from cPanel.

1) Your Internet Service Provider (ISP) has a short DHCP lease time, causing your IP address to be renewed/released and reassigned while you are logged into cPanel.

2) You are attempting to login into cPanel using the same account from two different devices concurrently.

Therefore in order to resolve the error message you may just need to relogin to the cPanel.