Currently Being ModeratedMar 13, 2013 9:06 AM (in response to LosersInParis)
You are the second person who has posted with a similar problem. You will notice that just below the three episodes which do show in the Store page it claims to list ten; all ten appear when subscribing and, confusingly, in the web page which appears when you follow your link.
I can't see anything obvious in the feed to cause a problem; I'm afraid this is probably a glitch in the Store software and there isn't anything you can do about it except wait and hope it sorts itself out. You could try emailing Support at podcasts 'at' apple.com - make sure that you emphasize that the web page version of the Store page shows all the episodes, it's only the Store page in iTunes which is wrong - but I can't promise you will get any sort of coherent answer.