@craigconstantine
I’ve figured this out. Looking at https://feeds.captivate.fm/podcast-pontifications page, there are two feed items
3 Easy Steps To Increase The Global Appeal Of Your Local Podcast [S3E55B]Season Three Starts Now!
both having their href value as https://podcastpontifications.com and that’s the issue. You can verify this by clicking the both of those feeds’ links.
The rss polling plugin uses the TopicEmbed model which enforces uniqueness of the embed_url. Both of these entries having the same embed_url, it overrides one of the entries with other’s content depending on the sequence in which it fetches both of the entries and creates a new revision of the topic’s first post each times it polls the rss feed. If you click on the 
icon on the first post, you’ll see the content alternating between both of these feeds content
The best course of action would be to reach out to the person responsible for running the site and ask him to correct the url of both of these items.