Subdomain with template from another site

[vitoliveira]

Good evening.
I got an annoying problem. I have a website called "eutuenos.com" and I wanted to create a subdomain "blog.eutuenos.com".
the problem is that when I do it the address is "blog.eutuenos.com" but with the template of another site I have .
Does anyone know why this happens? I use the cloudflare.