iTunes feed needs refreshing but not allowing me to

Everything seems to be OK - the Store is using the feed you linked to, and all five episodes appear in the Store and when subscribing. The only odd thing is that trying to validate it in Podcasts Connect produces the result 'prepared for submission' (meaning it's OK) where I would have expected the message 'cannot validate your feed, your feed has alreaady been submitted'. You should be able to refresh your feed in Podcasts Connect but as the Store is up to date there isn't much point anyway. When you next add an episode check that it appears when subscribing and that it appears in the Store within a couple of days or so.