RSS feed does not display properly

I have a problem with the rss feed for my blog https://www.healthydietweightloss.com. It is not displaying the way it should.
I have a couple of other blogs, and their rss feed URL is always https://www.myblogname.com/feed.
When I hover over the feed button on my weight loss blog, it displays https://www.healthydietweightloss.com/feed/rss. Why is that? And it does not work either way, with or without the rss at the end.
It just says “This XML file does not appear to have any style information associated with it. The document tree is shown below.”
What can I do?