When changing the Primary Domain name on an account, the FTP account names will change to match the new primary domain name. I see the FTP accounts in your account have changed over or been re-created.
You can always use either the primary domain name or the server name as the hostname to log into the FTP. You can find your server name on the left hand sidebar of your cPanel. It is labeled 'Server Name' and will appear in the format ehub## or whub## (where ## is the server number.) Iny our case it is whub25. To use that as a hostname for FTP, put whub25.webhostinghub.com as the hostname. This will work for you as well as using the new primary domain name.
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