Template issue with new tabs

[GamerPerfection]

I have an issue when I add a new tab to the navbar.

You'll see on my website i have the Darkness template when you go to the main page.
http://www.galaxyofstars.co.uk this is the same for the forum and blogs page etc.

However, when i add new tabs such as the arcade and donate tabs, the background template disappears.
http://www.galaxyofstars.co.uk/arcade.php
I have also noticed when this happens that the logout, settings, profile etc options right at the top are not clickable.

Can anyone explain why this happens to page's where I have added new tabs?

Or is it to do with the fact it's a new page? i.e. arcade.php or donate.php

Whatever it is, any ideas how I can fix it?