Dude33 You can forget about the suspicious devices. It is probably about the device 192.168.1.220. This is an internal process that should not actually appear, but sometimes does. Unmanaged switches are often reported in the device list, but they do not obtain an IP address because they are unmanaged. I also have an Apple TV, which is connected via LAN, but also recognises WLAN access via the Apple ecosystem. The device is also regularly listed in the Wi-Fi list without obtaining an IP address. Now you could argue that the IB should recognise this and not display these devices. Yes, that is the case. But it’s more of a flaw and probably won’t be fixed any time soon (if at all possible with the software module).
On the subject of accessing the GUI. Do you only have the problems from one device (PC?) or also when you want to access the GUI from another device (mobile phone connected via WLAN)? Have you installed ad blocker software (AdGuard or something similar) on the device (PC?)? If so, then define an exception for 192.168.1.1.