Well.. I was in my Guild Hall with Lord Yuan Of Xanadu (Factions char), having previously been at the Great Temple of Balthazar, then I clicked the Leave Guild Hall Button, nothing weird there...
Until!!! the loading screen for Shing Jea Monastery appeared.. I was like... ooooookay.. that's a little weird... perhaps it some game default arguement(?) but no! it got freakier... the starting story for Guild Wars Factions PvE played and I was back at the start of the PvE, fortunately I was still lvl20 and had all my skills... but this is indeed a Really Weird Bug.
It happened again!!!
This time I was in guild hall like last time, clicked Leave Guild Hall button, and then i ended up back at the start of factions again!!! ... This time it was with my Necromancer, Wraith of Xanadu (Factions char).