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Possibilities:
- Bot was unable to connect with your site.
- Blocked by robots.txt.
- Blocked by a meta nonindex.
- Network problem between Google and your sites.
- Unseen server errors triggered by Googlebot and not affecting browsers.
- Extremely low ranking page without enough inbound links and was dropped from the index one month, and the link was found added the next.
Possibilities:
Google has been regularly merging data from old databases into the current database. Not sure why they would do this, but I'm involved with a couple sites where we purchased a previously owned domain name that was showing only a url title in the results.
We bought the domain, put up new sites, and got our new content indexed. This was in june. after this update, the listings reverted back to the url-only listing that existed before we purchased the domain.
Another interesting thing is the other sites that are listed on the page with our site are also listings from several months back.