I desperately need help with this

When I access my site at http://www.domain.com everything is fine, and when I try to get into the admin panel by using http://www.domain.com/administrator the address changes to http://domain.com/administrator/index2.php after logging in.

Why is it doing this ??

I have checked my configuration.php file and the mosconfig_livesite address in correct, the reason I need this changed is my editor JCE won't work and keeps throwing errors at me like ACCESS DENIED when creating articles

Thank you in advance