Can’t edit pages

I can’t edit content on current webpages.

There is an issue with the editors, which I cannot resolve.

When using classic editor, clicking on the orange cog to edit does nothing. I’ve tried other editors also, but I cannot change current content, only add further blocks.

I’ve deactivated plugins, but no change

None of the main settings have changed and no new plugins were installed.

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