I would also advice deleting them off of the iPhone and re-adding the Apps.
Hold your finger on an app until they start shaking and you will see an X by the APP's, just tap the X to delete them
Go into iTunes, plug in your phone and go to the Applications tab and make sure the applications you want are selected. Then re-sync and add them back over.
See if that works, if not you might want to completely delete them off of the iPhone and the computer and re-install them.
If that does not work I would do the above.
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