FYI: Your RSS feeds are not valid meaning you have no guarantees anyone can
subscribe to them. I suggest changing generators.

W3C provide a validator you can use to check your feed's compliant that's
pretty good [1], or just make sure you follow the spec when generating the
feed.

One error their validator returns that seems non-obvious is:
url must be a full URL: https://media.blubrry.com/[...]"

This is due to the specification stating [2]:
The url must be an http url.

[1] https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Flinuxgamecast.com%2Ffeed%2Flgcweeklyaudio%2F
[2] https://validator.w3.org/feed/docs/rss2.html#ltenclosuregtSubelementOfLtitemgt