One of my episodes is not showing in itunes

Hi friends,

My podcast, The Joyride, has 5 episodes published so far.

Castfeedvalidator and Stitcher both show all 5, but iTunes is not displaying JR004 - which is actually the most popular one due to the interviewee.

I don't see any material differences in the way these were published. Anyone have a hint as to why this one would be missing?

Feed: http://joyride.libsyn.com/rss

iTunes store: https://itunes.apple.com/us/podcast/the-joyride/id1094750824?mt=2

Any ideas would be greatly appreciated.

Thanks in advance,

~C