My Sitemap Has No Styling

Hello, after recently taking a look at my sitemap, I’ve come to realize that it looks nothing like it should. It has no styling and the markup is non-existent. Could someone please take a look at this and let me know what’s going on?

https://www.nintendonews.com/sitemap.xml

Thanks,
Kevin

https://www.ads-software.com/plugins/google-sitemap-generator/