Like this the picture below.
For the record, I did install some cracked apps which isn't available for demo from MAS to try them out. Could this be problem?
I'm on Mountain Lion, latest update. But I have experienced this problem on Lion as well.
MacOS – Mac App Store shows an update available for an app I didn’t install
mac-appstoremacos
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Best Answer
According to http://hints.macworld.com/article.php?story=20120727110524438, you would want to check the
/private/var/db/receipts/folder for any files related to the app.If the piracy messed with receipts, you may need exceptional records to clean up another app's receipt so this confusion might still be a result of your abuse of the normal app purchasing process.