I am guessing you have a RT-AC5300 router, the 5012G and llium_520g connected to the router wirelessly (or wired) and your windows machine connected via the lan (by a cable, as that's what I think you said). If that's correct, then what you are seeing is correct. Disabling the Wifi on your PC will not stop you seeing wireless devices connected to your network.
Does that answer your question?