These aren't the same answers.
The https://check-your-website.server-daten.de/?q=updatefitness.com doesn't has a redirect http -> https, the non www /.well-known/acme-challenge and the www /.well-known/acme-challenge are different.
Your check of https://check-your-website.server-daten.de/?q=update-fitness.com
Both /.well-known/acme-challenges - checks redirect to https, both have the same (long) content.
So the update-fitness.com looks good (and has a new 90 days LE-certificate), but the updatefitness.com may use different vHost definitions.
Start with your port 80 vHosts.