New Posts are not populating in RSS

Hello,
I am having an issue with church my RSS feed. I didn’t create the site, but I’m helping administrate it. This is my first time here, so if this post is in the wrong place, please let me know.

The site is http://www.hillspgh.com and the feed is http://www.hillspgh.com/feed. All new posts we have made (podcasts mostly) are not showing up.

The research I’ve done on people having trouble with RSS feeds always involves an aggregator issue of some sort, but I’m looking at the feed through the site (not using feed burner or anything)

I’m not sure if plugins would be an issue but if they are the plugins we have installed:
Akismet
all in One SEO Pack
Bulk Image Resize Utility
Contact Form 7
Countdown Timer
Donate Plus
Event Espresso Lite
Hello Dolly (not active)
MapPress Easy Google Maps
Page Peel (not active)
Podcasting Plugin by TSG
postMash
Really Simple CAPTCHA
WordPress Importer
WP-EMail
Wptouch (not active)

I’m not sure why it would just stop creating new posts…