Your feed is at http://www.adventuresinya.com/feed/adventureyapodcast/
It was constructed in Wordpress, and contains the same 50 episodes which are showing in the Store. The reason for this is that WordPress, in common with many podcast creation programs and services, limits the number of episodes shown in the feed, removing older episodes as new ones are added once the limit is reached. In this case the limit is 50 (I seem to remember the default in Wordpress is 20 so it may already have been changed).
Though I have no experience of WordPress, poster seogroup reported that this could be increased in Dashboard > Settings > Reading > Syndication Feeds Shows the most recent ____ Items.