Sorry, really stupid question. Some time ago I managed redirect of domain to direcotry to get working. However, noob as I am, now I can't find how and where. Spent googling couple evenings, found several methods, but it should be always in the site config file or htaccess, right? So to get it short, I redirect something.domain.com to domain.com/something, both addresses are working but I don't know how and where to adjust it. And btw, all subdomains are probably transferred to the same folder...
I found that. The trick was default.conf was empty, so all requests were served by the only site. Nasty