There are frequent ‘duplicates’ in the feed for robertsspaceindustries.com
Most recently for example we have 10 For the Producers which showed up on Newsblur as both “10 For the Producers” and “10 For the Producers Episode 7” even though there is only one item in the feed (which is a valid feed). The item has the title set to “10 For the Producers”, there is no item with the episode in the title, however, in the content of that item there is a
tag which has the title plus episode so it seems Newsblur is grabbing that and making it a story for whatever reason.
Apart from the title they are identical in Newsblur, content, tags, timestamp, everything so it’s rather clear the item is being duplicated.