PR Update?

Just today, I have noticed that my Page Rank went down by 2, from PR4 to PR2 on the Google Toolbar, however as I checked it on the PrChecker.info the result is still PR 4, strange huh!? And I tried this PR checker and the result is even worst, I got PR0. lol

Well, anyway maybe this is just a temporary update or something. I kept on hitting F5, but still the display on PageRank Toolbar is still PR2, and I even re-started my unit, BUT still the same results I’ve got. Whew!