cache and freshbot

For a query on google.com the cache version of my site is the updated version.For another query is the old version.Why this??
Another question....is it possible that freshbot visits more frequently the main page of a site and less the pages on lower level??


Ciao Francesco

Freshbot visits the last page it visited, plus looking for any new page that is directly linked to that previous page. If it finds a new page, it will come back to that new page next time. You can increase the regularity of freshbot coming everyday if you give it a new page each day linked directly to the last page it visited.

See: http://googlevillage.info and its listing in Google by using the search term "google village" -- you will see every new page freshbot has been fed each day since January 2.