Optimizing Feeds

Hi,

I need to fix an issue with one of my Feedburner feeds.

The feed is:
http://feeds.feedburner.com/gaterocket/news

The main site feed is:
http://feeds.feedburner.com/Devicenativecom

The first feed is a feed of the news category from my site which is at http://www.devicenative.com

The second feed is the main site feed.

The “more” tags do not work in the news feed but do in the main feed. If you select the news category from the site the more tags work fine:
http://www.devicenative.com/category/gaterocket-news/

The feed address I entered in feedburner is:
http://www.devicenative.com/wp-rss2.php?cat=5
Category 5 is the news feed.

Can anyone tell me how to get the more tag to work with this feed?

Thank you,
Dave