Perhaps you have the the 'new' market as your 'current' market. Seeing as how the update isn't all at once, I can see how that error could be made..?
Sometimes, when bored for example, I like to look for other apps to download that I might use (or games to play). The reviews are nice for that, but it makes it a bit more difficult with the 'new' market. The app name, icon and download progress are locked in place at the top third of the screen.