Feed Wont Validate (odd media URL)

Here’s the feed URL, so far we have one episode, and I’m trying to get it validated by itunes
https://www.activistpost.com/feed/podcast/vinarmani

There’s this odd media URL that’s appearing in the feed, and I have no idea where it’s coming from.

You can see the feed validator results here.
https://castfeedvalidator.com/?url=https://www.activistpost.com/feed/podcast/vinarmani

The media link leads to https://www.activistpost.com/podcast-download/141731/1.m4a. Where did this come from? I have set the enclosure URL to our amazon s3 acct, and made sure that URL is publicly accessible and working.

I’ve tested a few other podcast series as well, and the same thing happens. The download link leads to a non existent location.

Please advise, thanks.

Brian