Hello,
As I am new to the freelancer world, let me introduce myself. My name is Valeri Kratunkov and have worked as a technical support for one of the biggest hosting providers. Since you have changed the nameservers for the domain name and added it as addon, the issue most probably is related to the configuration of OsClass. However I can review the settings and the redirects so I can find the reason for the redirect issue. If you are interested, please contact me so we can discuss the details.
Best Regards,
Valeri Kratunkov