It looks like a different plugin of your blog interferes with podPress. It is probably plugin which scans or modififies the post output of WP. Maybe it is a statistics plugin (e.g. Google analytics) or the plugin which adds the Facebook, Google+ and Twitter button to your posts.
You may find which one it is by doing the following procedure: deactivate one plugin, reload/open a page with podcast post, see whether something has changed and if nothing has changed, reactivate the plugin again and try the next one.
If you know which plugin is responsible, you could try to find a plugin with a similar functionality or maybe I can try to find a way help.