At first glance it appears to be a CORS issue with the following details.
This line here
<meta name="Referrer" content="" />
Gives an error of
Failed to set referrer policy: The value '' is not one of 'always', 'default', 'never', 'origin-when-crossorigin', 'no-referrer', 'no-referrer-when-downgrade', 'origin', 'origin-when-cross-origin', 'same-origin', 'strict-origin', 'strict-origin-when-cross-origin', or 'unsafe-url'. The referrer policy has been left unchanged
This led me tho to the following post here:
https://moz.com/blog/meta-referrer-tag
Which explains your issue precisely and why the 'random' behavior is occurring (its not CORS after all). It is occurring whenever you refer someone to the url (ie clicking on it from stackoverflow is a referal; but not when you refresh the page as there is no referrer (ie you didn't come from a link on another site). I suspect that because of your content=""
value not being accepted as a legitimate value (see the error message or blog article for proper values) that the browser is guessing it to be <link rel="alternate"
which is your rss feed.