You have some misconceptions on how to do this. One of those "wans" have to be a public ip address.
Internet<>wan [public ip] router [private ip 192.168.1.1] lan<>wan [private ip 192.168.1.4] router [private ip 172.16.0.1] lan
As you can see you can't have two wans on 192.168.1.0/24 subnet or no routing can take place.
If the scenario is you have added a router to an existing router [they are in series] to port forward you have to set the 2nd routers wan port as static ip address. You forward the ports in the main router to that fixed ip address. Then you forward the ports in the 2nd router to pc hosts static ip address.
Edited by Wand3r3r, 13 April 2016 - 02:41 PM.