header.php changes not rendered

When I edit the header.php file (in the theme editor), the changes are not rendered in the browser.

The header.php file is changing as I checked the html file. Even when I make changes directly to this file, they are not rendered in the browser. I tried clearing the cache, using different browsers and logging off.

t is as though the browser is calling the script from an archive file that has not changed. Any suggestions? Help would be much appreciated.

I am using the rounded v2 theme.

Thanks!