I have noticed an issue when running a site audit on all of my websites using SEMrush I picked up the error:
All the sites are WordPress and some use a child theme and some do not, the example site does use a child theme.
The style.css error is currently on 34 pages but not all.
I did update the permissions after editing the files but nothing has worked, the current permissions are dir 755 and the stylesheet is 644.
I am not sure what the issue is as it does not look like the permissions are the issue and if it was the child theme not loading the stylesheet then it would break across all the pages.