Aerora or Aera?

I remember when I first started casting the -ra spells on Geomancer, that /ma "Aerora" <t> wasn't working. Scrolled down the spell list, and it was listed as "Aera". So I thought, "whoopsies, my bad!" This was around a year ago.

Fast-forward to today, when I'm doing Alluvion Skirmish in Yorcia. I get a scroll of Aerora II! Yay! --wait, what?

The scroll description even says that it teaches the user "Aerora II". So... which is it supposed to be? All three tiers are listed in my spell list as "Aera" "Aera II" "Aera III" and only respond to that. The scrolls listed on the Auction House are "Aerora" and "Aerora II", though.