[SOLVED] 139 Clients Connecting Through My PC? Don't Think So

I'm really happy with my RT-AC68U. No complaints. But there is this one little thing:

My desktop PC connects to the router with an Ethernet cable. My PC does not have a WiFi adapter. So imagine my surprise when my router's network map told me that there were 139 clients connecting to my router through my PC. I don't think so.

Must be a one-off, I thought, so I powered off and powered on the router and the 139 clients disappeared. However, just now I checked my router's Network Map...

[SOLVED] 139 Clients Connecting Through My PC? Don't Think So