Desktop gets mobile viewport and general issues when loading posts

Hi all,

Thanks for taking the time to check into my issue and for your help.

I run the latest versions of all plugins and WordPress but for a couple of days now we have issues about desktop browsers loading the homepage is mobile viewport and that loading a post then causes this error:

The site is experiencing technical difficulties.

The issue appears in various browsers and does not seem to be session related.

– Until now I tried to disable plugins to spot any culprits without success.
– I tried clearing the cache on W3 plugin as well as on Cloudflare CDN without success.
– I updated the theme Newspaper to the latest version without that making a change.

As of now, I am uncertain what else I could try. Does anybody have an idea perhaps?
Many thanks in advance to all you helpful, awesome people. 🙂

– Chris

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