I had something similar happen to me, once, years ago when I was just a newbie. The game crashed, and when I got back in, I had spawned somewhere in the north, in a region I had not yet explored.

It hasn’t happened to me since, but I guess it’s not totally impossible that some bug confuses respawn coordinates if you die and are at the same time in the middle of “logging out” (with the game crashing etc.).

So, I assume you fell off the column you were climbing during this disconnection, died, and the game couldn’t decide where to respawn you, so you ended up in a magical place. That shouldn’t happen, of course.