How did you create that list of episodes?
I'm asking because I can not imagine how you would achieve this with podPress.
It is possible to add 300 media files to one post. In order to do that you would have to set this value (podPress > General Settings > section Post Editing - max. number of media files:) to 300. This setting determines how many media files you can add to a post via the podPress box below the post editor. But it does not regulate the number of media files which are displayed in the blog post. For instance if you set this value to 10 and you add 10 media files with podPress to a post and if you set the value to 5 afterwards then the post will have 10 episodes (until you update it).
This setting has only effect on the podPress box at the post editor page.
If you have created the list in the post not with podPress then of course this settings has no effect on the episode list either.
So please try to find out with which other plugin/tool this list was created. podPress does not produce such lists.