One particular message always comes back as unread

There is a particular message in my feeds that always appears as unread in Lightread. It does not appear as unread in Google Reader, and when I click on it, it is marked as read like normal in Lightread. The problem is that whenever Lightread syncs, that message always shows up again.

I am not sure I would reproduce the problem for somebody else, or how I can give you any more relevant information on the subject, so if you need me to do something extra to provide you with data, I can.