Domain Parking Issues

[Simba]

Okay so I got the Domain Parked/Forwarded whatever you wanna call it. However I am having issues with Logins.

If I go to my website (http://houndsofanubis.us/) and click login I can login without an issue, Then the page reloads and I am logged out for some reason. 

https://prnt.sc/jumrj2

I notice that when I click Login it takes me to (http://www.houndsofanubis.us/member.php?action=login) Theres a www. in front of my domain 

https://prnt.sc/jumrne

After logging in it takes me back to the http://houndsofanubis.us/ address. If I add www. in front of the url it then allows me to stay logged in. 

https://prnt.sc/jumrsg