Why is my iTunes Podcast not updating?

I have been using FeedForAll for the last 2 years and just moved to writing my own xml code. I cannot find any discrepancies between the code I'm writing and the code written by a podcast creator app. 14forty Audio Podcast.

iTunes Link:

https://itunes.apple.com/us/podcast/14forty-audio-podcast/id514087107?mt=2

FEED XML file:

http://14forty.com/podcast/feed/14forty_Audio_Podcast.xml