Only Unplug Can Turn Off PC and Internet!

Axiomatics of inquisitive endeavors: 

I experience something strange. I turn my PC off via Start, Power, Shut down. You’d think my PC is off for all intents and purposes. Well, my PC is still on. The Internet connection is green on the router!

My PC runs Windows 11 Pro 25H2. The PC is linked to a router via Ethernet. The PC and the router are powered by a 5-port surge protector. Each port has its own switch on/off.  The surge protector is made in China. It also has a digital clock and, assumingly, some radio transmitter! I assume the existence of a transmitter because the manufacturer warns about potential interference with radios and TV sets in the vicinity.

I noticed the Internet on after I shut down the PC. I turned the surge protector port off. It refused! The LED light stayed on, and the Internet LED light on the router remained on! I unplugged the PC. The Internet light went out. 

After a few tries, I succeeded to turn off the PC port on the surge protector. The Internet is turned off as well. So, I always turn on the PC port, the Internet LED turns on, then I do the normal PC power on routine (POST). 

I wonder what happens and why?

Ion Saliu
Internet Watchdog At-Large