#13 - May 1, 2007, 2:01 a.m.
Basically, if you're Horde and for any reason the game is unable to identify which graveyard to send your ghost, you'll be ported to Crossroads. It's not necessarily a bug connected with a specific portion of a zone, there are a variety of factors that can cause this type of communication failure.
Fortunately, it's very rare.