Elementals being found all over the world and not just the Twelveswood is why there are records of some Padjal leaving the Twelveswood. That's why the Padjal who made your soul stone died. It's also why the HQ WHM job quest had you and the other Padjal going to Dravania. There was a person there messing with Dravanian elementals to mess with the headwaters of streams that went into the Shroud eventually.

One of the consistent themes of the WHM quests has been that things outside the Shroud do affect what goes on in the Shroud. So the Padjal need to remember to look beyond their borders at times if they really want to fix problems. And leaving the Shroud was something the Elementals really didn't want the Padjal to do since it put the Padjal beyond the reach of the Shroud Elementals... who are the ones who determine who is born a Padjal and who isn't.

The Elementals in the Shroud really don't look beyond the Shroud... because "outside the shroud" isn't where they live, so anything outside the Shroud isn't their problem to fix. They are very location bound.