PHP theam issues with layout

I have installed a plugin called WPBB for my forums. All is working well except for when viewing a post the php code is wrong. Some content strays off the page template into the background and the footer streaches itself to the full width of the browser.

This is how it should look
http://www.officialtjp.com/forums/?forum=2&current_page=1

This is the footer error
http://www.officialtjp.com/forums/?forum=2&topic=1&current_page=1

As you can see I will have to edit the code in the plugin but im not sure what to add to fix this. If anyone can point me in the correct direction it would be greatly appreciated. Thanks in advance

Jamie