Any subdomain name that’s not in use is redirected to a domain parking page. That’s the page you see.
If this happens for a domain name that’s assigned to a hosting account, that’s a problem, because new records should have been added for your domain when you added it to your account.
But if you deleted the domain from the account, then seeing the parking page is perfectly normal, because the subdomain is not in use.
In any case, if you don’t want watch.1001mb.com to show a parking page, please add it to an account.