I had two separate characters that were outside of the war walls in Siren's Call when I logged in. They both had been sitting just inside the zone entrance from Steel Canyon to work on the Predator day job. I did not think to /loc my login coordinates with either, but the X marks my approximate location. With the second character, I started to work my way around the outside of the war walls. I marked my approximate flight path along the invisible walls with green -- that's as far as I got before my buddy showed up to bail me out with ATT. Granted that this is some version of a vidiot map and I cannot speak to the map in the game, but per the pic, the zone is rotated 90 counterclockwise. Presumably, the coordinates of my previous logouts were outside the new map after the rotation.
Edit part deux: Had another character logged out just inside Siren's Call. After falling to the ground, my location is: 990.0 -176.1 -1208.1