Same App Store updates continue to appear even after apps are updated?

Why does the App Store continue to say that apps need to be updated after they have been updated?
iBooks Author, Network Strength, TerraRay,iArt Pro, All have been updated yet every time I open App Store it shows the same Apps need to be updated.
How can I fix this problem? Step by step insturctions would be greatly appreciated. THANKS in advance.

HI Gerry ....
Try deleting the cache associated with the App Store.
Quit the App Store app if it's open.
Go to ~/Library/Caches/com.apple.appstore/Cache.db
Move the Cache.db file to the Trash.
Launch the App Store. See if that helped...
~ (Tilde) character represents the Home folder.
For Lion:   To find the Home folder in OS X Lion, open the Finder, hold the Option key, and choose Go > Library

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