Alias domain redirecting to maindomain instead of the alias domain

[hendry]

What I meant is this:

Client has http://www.domain.xxx under /htdocs
Clients adds second domain (alias domain) http://www.domain.yyy under /domain.yyy/htdocs

When trying to reach http://www.domain.yyy on the internet it shows the content of http://www.domain.xxx. There is no redirect active. Both domains are added in an external DNS wich is not running on the ISPCP server

Tonight I added under an other client a subdomain and this one refers to the loginscreen of ISPCP. What is happening here? I lost it completely