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Google probably found links to these pages from our main site. Does this just mean that they haven't indexed the pages themselves but have the URLs in their list?
During june i went and did a link: search and looked thru all my backlinks. Every single one had a description etc. When i did the exact same search today 20% of them have nothing but the URL listed. But when you click on the url the page linking to me comes up fine etc.
Another thing you could try is to choose one of the odd link pages, and do a very specific search for something on it (like a complex phrase). If it doesn't come up, then the mismatched DB theory might make sense. If the page is found with your search, the it sounds like some kind of malfunction in Google is simply not displaying titles/descriptions.