Site is showing VC source code

I cannot tell what happened, must have been in the course of November when I received a notice that our site didn’t look right. Maybe it was compromised, but at least I could restore the site structure. I have tried to mend the remaining problem of the display of Visual Composer sourcecode with an 4-week-old back-up of the entire site (the oldest I could track down). Plug-ins were updated and the latest WordPress 6.7.1 is running. Some elements are shown properly, yet surrounded by source code beginning with [vc.

I have deactivated the Elementor and the VC plug-ins with no effect.

I am not a WP pro, just trying to maintain the site which was built a few years past and the developer is out of reach.

Thanks for any help.

Rolf

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