There is something a bit odd about those details. If you are connecting via a router, it is the router that connects to the ISP and the computers get their access over the LAN from the router.
However, your PC seems to be connecting directly with a PPP connection to the ISP and getting the public IP address (18.104.22.168) that the router should be getting. Have you plugged a USB modem directly into the PC?
Your details also show:
"IP Routing Enabled. . . . . . . . : Yes"
suggesting that you have Internet Connection Sharing set up on one of the PC's internet connections. Unless you are running an ICS "client" PC from this one, ICS shouldn't be enabled.