When I try to access by using /sitemap.xml it just loads the homescreen with no change in URL, whatever I give next to slash it gives me the homepage.
I think sitemap.xml is not found so it shows the homepage. If I don't use htacess it works.
This the code of htaccess:
RewriteEngine On
RewriteRule ^([^/]+)$ index.php?page=$1 [QSA,L]
RewriteRule ^/$ index.php [NC]
You have to exclude the sitemap.xml from the rewrite rule that currently catches it, for example by adding a rewrite condition in front testing not being the sitemap filename:
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !/sitemap.xml
RewriteRule ^([^/]+)$ index.php?page=$1 [QSA,L]
RewriteRule ^/$ index.php [NC]