Keynote app does not appear on my purchase list
I currently own a Macbook Pro and within the past year I have purchased apps such as Pages, Numbers and Keynote. Recently I purchased a MacBook Air as well when I began downloading all my previous apps such as Pages and Numbers on to it, my Keynote app was missing. It does not show up on either of my Mac computers (Pro/Air) purchase lists within the app store as well. Instead the app store on my MacBook Air show the purchasing price of $19.99. Why do I have to repurchase the Keynote app when I've already paid for it once before?
MacBook Air, OS X Mountain Lion