Domain without www in a loop

Hi, our domain without www.domain stopped working. It is in some kind of loop.
I checked with Siteground and they say that the problem is at Cloudflare.
The version with www does work fine.

https://venus-berlin.com/ not working
https://www.venus-berlin.com/ working

Sometimes after clearing the cache it does work but today is doesn´t.

I tried to add @ folowed by the IP address to the DNS but it indicates it already exists.

This page returns the following HTML (formatting mine) which is cached (cf-cache-status: HIT)

<html>
 <meta http-equiv="refresh" content="0;/.well-known/captcha/?r=%2F">
 </meta>
</head>
</html>

Returns a normal HTML page.

Thanks, do you have any idea where this code is coming from and how to remove it?

This is in my Htaccess file

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{HTTP_HOST} !^www\. [NC]
    RewriteRule ^ https://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
    RewriteCond %{HTTP:X-Forwarded-Proto} !https
    RewriteCond %{HTTPS} off
    RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
</IfModule>
# END HTTPS
<ifModule mod_headers.c>
	Header set Access-Control-Allow-Origin: *
</ifModule>


# BEGIN WordPress
# Die Anweisungen (Zeilen) zwischen „BEGIN WordPress“ und „END WordPress“ sind
# dynamisch generiert und sollten nur über WordPress-Filter geändert werden.
# Alle Änderungen an den Anweisungen zwischen diesen Markierungen werden überschrieben.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

Nope.

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