a problem to display the template itself

Hi!
I’d love to use Neve for my website: https://rbjal.com.
However, I got a problem to display the template itself.

Whether I go to “customise” or “edit page” or “view website” options I’m getting a plain text with ” hello world message”, but not the Neve template itself.

This “phenomena” happens only with Neve; other templates work correctly and I can edit the home page straight on the template.

I have installed the plugin “Orbit Fox Companion”, however, it didn’t help. Any advice?

Many thanks in advance

The page I need help with: [log in to see the link]