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The main site is cached and has a PR0, since it hasn't got any incoming links yet. The subdomain, which also doesn't have any incoming links already has a real PR3.
I have searched for any pages that contain the subdomain (none), checked that the page is cached properly (it is).
The only possible explanation that I can think of is that there has been a link to the page that was spidered in the main crawl, and thus used for PR calculation, and that the page has since been dropped by Freshbot. However, this seems a little unlikely.
Any other ideas about how to generate a PR3 apparently from nothing?