When I open a page URL:
The normal article will be shown.
If I open up the same page 100 times with deleting cache, it will show 2-3 times the RSS Feed of the article and not the html page / article itself.
I have seen this, because google shows comments sometimes in the results. I have this on all pages on the server.
How can I debug that problem to find out where it comes from?
Latest WordPress, also on installations without plugins.