Common bug that affect some other games when there is a package with 2 or more games of the same franchise (Tomb Raider has some problems with that too).
It's because of that http://store.steampowered.com/sub/12357/ I guess.
It's not the SG fault, it's the Steam fault, they probably have changed the package ID or something like that.
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I don't know if this is an error or what. In Steam it costs 19,99€...
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