Mac App Store shows all my apps have been installed when they haven't

I just re-formatted my Mac to Mountain Lion, and I'm trying to re-download my purchased apps from the Mac App Store. Problem is, however, that with the exception of about 7 apps, every other app shows that it has been installed, when I am accessing the app store almost right after formatting. I've tried logging out and logging back in, but to no effect. Has anyone else seen this before?

chrfr said:

Do you have an external disk attached which has those apps on it? The App store App will find installed Applications on all disks.

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Well that explains that. I had backed up most of my purchased apps to an external hard drive. Thanks for that.