Each LW will need to be forwarded to a different port. Routers reserve a single port per program per computer. And will disallow connection from other programs or same program on another computer trying to use the same port. Thus, each of your LW's will need a different connection & listening port. Ranges of other ports to try 49152 - 65535.
And don't forget to set each LW to those ports you allowed for those computers: Manual port forward instructions & sample image