One of my podcast episodes is not listed on iTunes services

Hola Apple Folk,

I started a podcast last year, originally on my own personal Wordpress site then moved all the content to a new website. I reposted old episodes to my new site and removed them from my old site then updated my feed. For months, all of my episodes appeared on the iTunes store, Podcasts app, and other apps like Stitcher. Just recently I've noticed that my very first episode is now no longer available in any format, even though nothing was changed in the post and the url still verifies. What's the most likely reason that a single episode might go missing from these platforms?

Website: http://cratediggers.net

iTunes Page: http://itunes.apple.com/us/podcast/crate-diggers/id793601542?mt=2

Thanks!