Background not appearing for page hero

Are you using the [category_background_image] shortcode as the URL() src on the <style> tag within your Header Element area?

If yes, this is strange. If the var_dump returned null then there shouldn't be any value here https://share.getcloudapp.com/4gu2kN5x

If you're not using this shortcode within the mentioned style tag, can you share with us the code within your Header Element?

Yes - and to be honest, the var_dump shows the image URL for other pages where the background image shows - just not for specific categories for some reason..

It shows a 'NULL' for this category page, even though it has an image - the fact the picture of Shakespeare works is weird, since this uses a similar code..

Similar or the exact same? Can you share the code for that page where it's working?