Sounds like a caching issue.
http://www.dangerdogz.com is the main site index page, and should show only two buttons, one for home and one for forums.
Clicking home should do nada, forums however should bring you here.
The forums, http://www.dangerdogz.com/forums will prompt you to login if you try to post, it will also show a restricted view (some forums require membership to view).
I'm using google Chrome, have tested with FireFox and IE8 and not found any issue with logging on.
Software does detect that you may have logged on from another system (can even be 2nd browser or a pc on same IP) and will ask you to revalidate and will terminate the old session.
So if you have left the browser open on the forums on, say, your home PC. Then login on your work system, when you come back home it will appear that you are logged in until you either refresh the page, or click a link.
You will then be prompted to login again.
This security measure helps protect our system from attack, and also aids your privacy.
If you have more than one tab/button showing for the first link (the home page for dangerdogz.com) then this sounds like IE has cached the site and has not yet refreshed the page.
ctrl+f5 should fix that.
The home page will be changing soon, and will be integrated with the forums properly.