We did not go anywhere, I haven't left town at all. I just spawned at a random place in the middle of nowhere.

EDIT:
Obviously the /home point has been moved. I read this can be caused by someone exploring very far, replacing the spawn point to a new region. The same happens with weather conditions (e.g. could change the entire world from snow to grass).

So either the server had a hickup and altered the spawn point or someone explored too far. There was an artificially made burning pillar at the strange place, so someone has been there before.