My site gsmdna.net got pr1

but when i write gsmdna.net it shows pr0
when i write www.gsmdna.net it shows PR1

and same thing is with gsmdna.com domain
when i write gsmdna.com it shows pr1
when i write www.gsmdna.com it shows PR0
(reverse lol)

but my aboutwebmaster, it shows the same even with www or without www.
man.. whats this..? I cant understand!