I know whyOnis screwed up pvp in different worlds because of the different algorithm from the current world of spawn. Onis attempted to recreate the code of pvp, to make it better, and then dispersed it to different worlds, allowing some unnatural pvp and odd mechanics, go to kitpvp and you'll know what I'm talking about.
EDIT : Look at my thread called "what happens when pvp breaks" It's under the subtopic PvP. This is sort of what's going on