Heh. You have a plugin that deals with comments in some fashion, would be my guess.
Searching for Voltron gives 8 results. It's not increasing, it's stuck at 8 (for now). Notice how that post also has 8 comments? That ain't a coincidence.
Some plugin you have is modifying the main query that retrieves the data from the database. This data goes into what's called "the Loop", which displays, well, everything. All your posts, all your pages, search results, everything of any substantial content goes through the Loop.
So, some plugin is causing your posts table to be joined to your comments table during the search. This results in duplicated posts being returned in the query, which the Loop happily displays.
Solution: Figure out which plugin is doing it, stop using that plugin, and tell the plugin author about your problem so he might have a chance to fix it.