Some feeds not updating

I have this feed (amongst many others):
http://feeds.feedburner.com/Kellerman…
When I check the contents from NewsBlur, the latest articul is dated 11 January 2014, but if I copy the feed address and go to the web site I can see many, many articles dated later (with the latest entry 25 August 2014).
Why is the feed not picking these up?
Amongst the many feeds I have, a handful have this same problem, it’s not an isolated case.
Thanks,
Martin.

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