UCP is enabled but still not live

Hello

Even though the UCP is enabled the UCP Landingpage is not live, visitiors are still able to visit my website? What is wrong?

I have also checked: https://underconstructionpage.com/under-construction-tester/?ref=ucp-free-faq-tester&url=https%3A%2F%2Fpanova-360.de:

Under construction mode is NOT enabled on your site. Google and visitors will see it as a normal site.Response Status:?200 – OK
Site Title:?PANOVA – Digital Reality is under construction
Powered by UCP:?No

It only works as soon as I open ti with a random variable: ?rnd=28374

Open in?incognito window still no UCP

caching plugin is deactivated

I have opened my website also on different browser and devices, still no UPC

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