bug report - FQDN

Hi,

there are two firewalls acting as resolver with a few host overrides and having access to the dhcp lease list. Firewall A is in the Domain override List at Firewall B and FW B in the list of FW A. The Domains of the FW are listed as search domains. When I do a nslookup to query a host only with the hostname, so that the search domain can be automaticly added, I get back the IP, and everythings fine. I can do that all day long, everything works. As soon as I look for the fqdn host.domain.intern, I got only one time back the IP, and after that, everything is broken.

Is this a security setting or a bug or, what am I doing wrong?