I host a small tekkit server for myself and my friends. Up until recently, everything has gone pretty normally--however, just now, we've noticed lit netherrack spawning in the overworld. I'm reasonably sure this isn't someone messing with everyone-- the spawning seems pretty random and in areas where people don't normally tread, but is concentrated around the portals themselves.
We're all pretty freaked out. Any explanation, or is my server haunted?