http://sebastianraschka.com/ 
I tried refetching and parsing but to no avail. This is just for one site I noticed and it makes me wonder if this is the case for any other sites!
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It’s because the feed doesn’t validate: http://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fsebastianraschka.com%2Frss_feed.xml
Let the publisher know so they can get it fixed.