In the App Store/Purchases, both Lion & Mt. Lion are indicted as available, e.g., both Download buttons are highlighted.
I called Apple Care and the tech advised that everyone with Mt. Lion experiences this and it is done this way in case I need to (re)download the OSs, and therefore it is safe to ignore the buttons.
But now I wonder, were I to ignore the buttons, what happens when 10.8.1 is released?
Indeed I am confused with this behavior (and the counsel from Apple Care).
Do you other 10.8 users also suffer as moi?