There's no hosting account linked with the forum account you are currently using, but since you provided a link to the site I was able to look your account up and go from there.
A possible cause for the failure when you are redirected to cPanel after logging in would be if port 2083 is blocked where you are currently trying to login, it is not uncommon for workplaces/schools to block ports that aren't needed for the task you are assigned to doing.
As for site not loading properly, I have not been able to spot anything that could cause it. All I get is a blank page which often indicates there's an error in any php file that would be requested upon loading the site, but there's no error message logged to "error_log" to help indicate what is causing it.
There was a few permissions that was changed from the standard values, I changed them back to standard values thinking that could have been the reason for site not loading properly, but that didn't change anything.