It's because some users post the link without the "www" part, and if your cookies already use set with the "www" part there, it takes you to the logon screen.
The best solution is when users make links to other places inside of BrainKing, is just do it like this:
<A.HREF="/game/ShowFellowship?fid=100"> link <./a>
(hide) If you want to find out more about some games you can check the links section and see if you find any interesting links there. (pauloaguia) (show all tips)