Some things about Google are really weird. For example, if you search for video converter and mp3 converter, my site is on the first page for both. However, one of the listings pulls the description from DMOZ and the other uses the page's meta description. They both use the title from the site. It's probably not "technically" weird. They likely have some very advanced system to determine which is used based on certain criteria...but it sure seems weird since they're the same page.
I imagine that it has to do with anchor text on the incoming links and with DMOZ being different sets.