There are eight episodes in the feed, and they all appear when subscribing in iTunes. However only three appear in the Store - the two most recent and one earlier one. I can't see any reason why this should be the case. Did you remove some episodes and then put them back? - this could cause this issue as the Store can take a couple of days to update. You could try refreshing your feed in your Podcasts Connect page, though I'm not sure that this will neccesarily force an update. Otherwise, give it a couple of days and see whether they appear. If not, you could try Support. Go to https://itunespartner.apple.com/en/podcasts/overview and click the 'Contact Us' link at the bottom of the page.