I searched but didn't find a post about this. A week or so ago I was mining some caves near the NE edge of the map. I ran up against the edge a few times and it bumped me back normally. The last time that day I ran up against it though it bumped me back and placed me on the surface. Has only happened to me once. Really not a big problem just an annoyance. Drew
its because it tries to tp you to the nearest available spot sometimes its a cave (when you are at the surface) and sometimes you go to the surface (when you are underground)
