Domain name is unable to resolved using the DNS

HI guys we are having problems with DNS servers that it was unable to recognize our internal hostnames, but it was working fine in reverse i.e from IP to Hostname. In ADC we had issue like FWD dns is recognizing the hostnames but they are old IP’s, and Reverse DNS is not recognizing. both ADC and PDC are running on zentyal which is based on ubuntu 14.04.