DNS problem?

[kilburn]

It's not an ispcp-related thing. You just used "ns{1,2}.domain.tld" as Name Servers when registering the "domain2.tld" domain, and as the panel defaults to "ns.<domain>" your server reports that the domain is hosted on "ns{1,2}.domain2.tld".

If you really want to use "ns{1,2}.domain.tld" you should change the bind's template files (look in /etc/ispcp/bind/db_{e,master_e}.tpl) accordingly