Hello p0et, thanks you found the solution! The Microsoft virtual WiFi miniport adapter was enabled for some reason. When I disabled it, it disappeared, and so did the strange SSID broadcast.

Model : Hardware Version : Firmware Version : ISP : Hello, I installed a TL-WN723N v3 on Windows 10 64-bit. The driver date is 12/10/2015, version 1030.3.0831.2015. I noticed that the adapter is...