Feed results for some categories empty for others not

I have this odd phenomenon where some categories feeds return no results while others do.

Results:
http://www.worldenergy.com/category/market-intelligence/feed/

No Results (there should be three):
http://www.worldenergy.com/category/in-news/feed/

Any ideas? The control panel shows that there should be three. I’ve tried creating new categories, they come up empty as well.