Search Returns Outdated Results

Right now, I'm looking at 27 results returned by 4 audio searches. All show a single source and all have the same IP address. I recognize all of them as files shared by me on another computer from their rarity, file naming conventions I use, and comments in the files themselves. It is extremely unlikely that some other user has downloaded and shared all of those files. An attempt to browse the host for those files fails.

The only problem is, that computer has not been online for over 24 hours. This has happened to me several times in the past few weeks. Anybody know why Gnutella continues to cache results from hosts that disconnected long ago? I never saw this behavior until recently.