I have a website that runs on. When I google for now, I notice that my website is running on a domain called www.tera.community. I don’t know this domain. How is that possible? If who clicks on www.tera.community what the request is executed on my server. How can I prevent this?
In that case this is not an issue with Cloudflare or with that other site, but your server is misconfigured and responds to all requests and not only those for your domain specifically.
You’d need to change your server configuration in this case. And while at it, also configure HTTPS properly on your server. Right now there is no certificate and your site is insecure.