Hey Vydarr =) Get your swimsuit if you haven't already =P

Like Vydarr said, I think it's the wording of the event text that is confusing. If there was separate elemental triangles there would be mention of it in the game. The way the elemental triangle is meant to work is that it is supposed to make you outright better at fighting certain things and worse at others depending on your affinity, so it makes no sense for there to be another triangle.

I've also fought many an elemental and i can safely say that water resisting fire and vice versa is false, and the elemental enemies are easily the best way to prove that the triangles as explained in-game are how elements work.