One thing to make sure of, go to PowerPress >> Settings, Advanced Mode >> Feeds tab. Check the boxes next to "Do not allow other plugins to modify podcast feeds." and "Feed Discovery" and click the Save Changes button.
Are you using the Yoast SEO plugin? It was recently discovered that Yoast is adding "no-follow" tags to some podcast feeds generated by PowerPress. The Blubrry dev team is working on a solution for this but there's no ETA yet as to when there'll be a fix. If you are using Yoast and don't absolutely need it, deactivate the plugin and see if that removes the "no-follow" tags.