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 are interested in a progress of a tournament you are playing, you can discuss it with your opponents at this tournament's discussion board. (HelenaTanein) (show all tips)