kindly check your host/domain provider as well. They might be able to look into the config/settings why is your site pointing to another domain simultaneously.
Yes I contacted them. They said this other person is pointing their domain to the server. Why would they even bother doing that?? What’s a foolproof and easy way to block traffic from their domain?
I don’t have the topic reference to hand, but it was given to me to rummage around and try to munge the nginx config to setup a separate default site. Never quite got around to actually doing it, though.