Did you turn off "enable only when connecting" in the Identd dialog? If you run a program like TcpView does it show that mIRC is listening on identd port 113?
Yes, that option was already disabled. Here is a screenshot from the TcpView program:

which doesn't show that the port 113 is used by mIRC (or by any others program, I checked) but using /run cmd /k netstat -a, it shows that the port 113 is listened:
Active Connections
Proto Local Address Foreign Address State
TCP 0.0.0.0:113 Wims-PC:0 LISTENING
When you say it is correct, do you mean the "External IP" displayed in the left hand column for an entry in PortForward?
Yeah.