Simple Yahoo Pipe not working

All I want to do is mix three RSS feeds into one, remove duplicates (based on the title) and sort the items by date of publish. So I built thi开发者_JAVA技巧s pipe (http://pipes.yahoo.com/nerdvanagr/olympiacosbc) which is just refusing to work: As you can see, for example, the 4th and the 7th item have almost exactly the same title so one of them shouldn't appear. Any ideas on what might be wrong?

EDIT: The general problem is stability, sometimes it works, some other it doesn't...

Just use item.title for unique and item.pubDate for the sort and you'll be fine.