wordpress wildcard subdomains inner files

I have a wordpress blog and i setup a wildcard subdomains into it.

My problem is when you look at my source code when entering subdomain, for example: https://bit.ly/1ObaFBo you see all the source code inner files ignore the subdomain and the files loaded from the main “www” domain and not the subdomain.

There are a lot of wordpress blog like this: https://bit.ly/1JLPD61 that i saw loading the inner files from a sub domain.

Can you help me on what i’m missing here?

Thanks