The number of episodes available for any podcast is decided by the podcast author and can differ from the list available on their website.
This American Life for example, lists only the latest few episodes in their podcast feed at any given time.
From a podcast’s details screen, you may have to tap on “Show Archived” at the top of the episode list to show all the episodes available for a podcast.
Note: If you would like to access even more episodes, contact the podcast authors.
