Fixed bug where some stuff could occasionally already be complete before you got to it. My fear was that this was some sort of savefile corruption caused by something screwing up when a file is saved or loaded. However, if that were the case, I'd expect it to cause creeping, progressive weirdness affecting the entire game, whereas all the damage was mysteriously confined to Sorrow Peak.
As it so happens, some of the flags used in Radioactive Hall were being inadvertently reused for various things in Sorrow Peak.