toolbar sometimes 'sewel'.
the pr cache from site you browsed before still not refresh on site you browsed later. to avoid that... open new tab/ window... now go to the site..
or.. go to this site : google-pagerank.net (it's not a google network btw)
btw, mine dropped from pr4 to pr3 :
Pergh.com
the forum from pr3 to pr2.
myblog :
Mysticdreamworks Studio drop from pr4 to pr3 too..
but another
one.. from pr0 to pr3
in my opinion.. most of my pr-dropped site actually the site is not in english.. not targeted for international user. The international site will getting better PR.
that is just my opinion lah