Model :

Hardware Version : Not Clear

Firmware Version :

ISP :

I'm using a TP Link TD-W9970 and I see 2 networks that are not the main wireless network that I set up. These unknown networks have the same name as the original network with EXT added.
Ex: My network name is tplink so one of the unknown networks is called tplink-EXT and the other is called tplink-EXT5G
I have no idea where these 2 "extra" networks are coming from.
How can I disable them? What is their source?