This is a problem for our guild as well.
I certainly appreciate Xelonir providing a link to the documentation on the wiki. Even so, I think this behavior flies in the face of intuition, and I hope we will see either:
1) A change to the game so things that are intuitively guild-specific aren’t also world-specific.
2) A detailed rationale on the wiki that describes why this must be how it works, and ample warnings in the game’s user interface (the sort of thing you need when you implement something that’s counter-intuitive).