Thanks for your patience with this.
Okay --- musicmagpie.co.uk - .webm video of the error at the link below... (see 4 seconds in) - this error happens repeatedly when browsing this site.
https://www.dropbox.com/s/nzq0yqqn1kgbw ... .webm?dl=0
Again, this website is fine on my fedora laptop and centos 8.1 on the same machine. No changes between boots.