XML Sitemap not showing header links and no click-able links

I don’t know how you can fix it, because I see cloudflare headers in server’s response. Reason is wrong Content-type.

$ curl -I https://wp-me.com/page-sitemap.xml
HTTP/1.1 200 OK
Date: Sat, 03 Dec 2016 07:27:00 GMT
Content-Type: text/html; charset="UTF-8"

$ curl -I https://wp-me.com/sitemap_index.xml
HTTP/1.1 200 OK
Date: Sat, 03 Dec 2016 07:25:46 GMT
Content-Type: text/html; charset="UTF-8"

Content-Type for sitemaps (they are xml files) should be text/xml. You need to check all cache layers.

PS. Some cache plugins (eg. supercache) serve all files as text/html. More info at https://github.com/Yoast/wordpress-seo/issues

Yes, the problem is with WP Super Cache.
When I disabled caching, sitemaps return to work normally.
What should I do to disable caching sitemaps?

In SuperCache you can do this via SuperCache >> Advanced >> Accepted Filenames & Rejected URIs >> Add here strings (not a filename) that forces a page not to be cached:

sitemap_index.xml
.*-sitemap.xml

By default supercache already have there: wp-.*\.php and index\.php. Add these lines bellow index.php.

I’ve created simple action (PHP code) which is more general solution. I think that previous settings work, but I didn’t test them.

More info:
https://github.com/Yoast/wordpress-seo/issues/5964
https://github.com/Yoast/wordpress-seo/issues/5110

That’s the solution, thank you!

I checked my sitemap and it seems ok ? Has the bug been fixed ? Thanks.

RESOLVED

Just wanted to add that Sasa’s answer worked for me.