Multiple PR's for 1 site

My site gets a different PR....

[jjdesigns4u]

My site gets a different PR when I bring up the site in different ways like:

with www. I get a nothing [grey]
no www. I get PR0 [penalty?]
with page extension /default.aspx I get a PR3

any clue on what it is?

[Brett_Tabke]

It knows. It knows that it is dupe content and the one that has the more inbound links - wins and cancels out the other ones. Normal.

[jjdesigns4u]

none of them have inbound links after the last update...