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This could also be Googlebot following "incorrect domain" links into your site. Let's say that the primary domain name that you promote is www.frenchguy.com. If another webmaster links to a page on your site at frenchguy.com/lyon.html, then you may see a normal-looking request for /lyon.html in your logs get 302-redirected because the domain name is not the primary domain - The page is OK, but the domain name is not the primary one.
This could be something you have set up, or a default configuration of your server. Try some testing to see if this is the case, or if there is any pattern to the redirected requests - is the page name, referrer, HTTP version, remote IP address, or remote host always the same?
Jim