Jet-Stream-Attack

Hi,

I was farming a Blue Mage spell on Wamoura : Erratic Flutter. At the same time it was defeated, I change glove, making a glitch. I then got the massage : Gooloader lerned Jet-Stream-Attack. It make no sense, and I cant use this spell... lock like its not a spell I think. Since then, I cannot learn Erratic Flutter.

Is Jet-Stream-Attack a bug ? If not, how can I use it. Why I have been farming Erratic Flutter for many days, many hours, without result.

Thank you for your help