Good day,

Thank you for contacting TP-Link.

Devices that looks have nothing to do with the modem. They are terminal - celulare and / or tablets, perhaps a notebook.
They are not signs of the router.

Regards,
Sergio

These devices are obviously tablets and / or cellular and / or notebooks, etc. But they are NOT connected to my LAN (Trust me, I dont have +43 devices). It is understood?. As I explained doing a factory reset, disabling WiFi and having connected ONLY my laptop to ethernet port, I can see many unknown devices, Even I could go to the admin of a fingerprint reader that you will know who is ...

The important thing is that as I can see (ping, nmap, navigate) this devices, they can see me too. Therefore it is a serious security problem.