It just looks like every one I check is coming up as forged PR.
I checked coachzero.com because it is supposed to have a PR of 3. I ran it through the page I mentioned and it came back as forged and mentions something about cocacolazero.com
I would recommend checkpageranking.com - because they give a detailed breakdown of whether or not your site is listen in the yahoo, dmoz directory as well as pagerank and domain age which I find very useful :D