If your website has changed PR in the last 4 months or so, you will notice that some data centers will reflect your former PR. This does not mean a website’s PR is any worse than a site that has the same PR across all data centers, it just means that the site’s PR has change recently.

Matt Cutts from Google has stated that some of the older data centers did not get updated PR because of infrastructure issues. When he first mentioned this at the November Pub Con, he also said that all DCs would be in sync early this year. As of today, we still have split PR.

So if you buy a link on a PR 7 and notice that some DCs on the Metrics Checker are showing something different, don’t worry, the PR reflected by the majority of the DCs is the “real” toolbar PR of the website.