I sort of know why and it is because wordpress puts my entire website into an iframe.
No, WordPress hasn’t put your site in iframe.
WordPress doesn’t do any such thing.
YOU (or your developer) have put your entire site in the iframe.
Your WordPress site is installed in a subdomain on a totally different domain:
You have iframed the entire WordPress site in the index file at the different domain you provided in your post.
Note that this is a separate thing from the Site URL!= WordPress URL you mentioned.
So your real solution is to configure your site appropriately to use the right address and get rid of the iframing.
Good luck!
No, WordPress hasn’t put your site in iframe.
WordPress doesn’t do any such thing.
YOU (or your developer) have put your entire site in the iframe
Thanks for your comment. You did in fact give me the key to the solution with this comment. I am the developer of this website and the website was created from a standard wordpress installation a month ago. So I have not made any changes to the index.php or any other wordpress file. BUT thanks to your comment I have investigated a little more and now I see that it is my webhotel provider who has done this due to a DNS setting I have used called “alias”. So their DNS system has done this Iframe. Wow, I never suspected that. So the fix for me is to change the DNS settings around or maybe even moving the website to another location.