I was doing some investigation into the PageRanks of my site, and if I clicked directly from a Google search to my site the PankRank would be 3. However, if I opened that same page in a new window, the PageRank would be 6. The URLs of the two pages were exactly the same. The only difference was the route taken to get to that page. It was a repeatable difference (i.e. it wasn't just a change in the PageRanks that day).
How / why does something like this happen?
Thanks,
Justin