Something is setting your <link> field in your feed to the title of your blog. It is happening on all your feeds, so this is not something PowerPress modifies.
<link>The Deeply Graphic Design Cast</link>
Go over all your WP plugins, most likely something else is doing this. You may also need a WP expert to solve this problem, as the <link> value is saved in the WP database, but I'm not sure if you can edit it directly in the settings.