Usually I use digpagerank to check the pr of my website, but I'm seeing strange results: google.com: The result sometime appear green (valid) and sometime orange (non confirmed) see here. The same happen with all sites, see yahoo.com here
The system might be too busy or loosely getting results for they are only fetching from other system which is from different Google data centers.
Its showing the correct details for me. It could be a temporary error while you checked the sites there. Check it again, might be that you get clear results. Regards