I have recently installed a mesh link system with one Deco M9 Plus installed to the router and two remotly installed in the house. Why does my old Wifi connection and the new Wifi connection show up. There is a Wifi connection for the wireless router installed by ATT and a new one established with Deco system. Shouldn't they cohesively work to get the most out of the Wifi? Also when setting up it asked what kind of internet my ISP provided? Does this really matter as I just selected the first one. 

As you can tell, I am not an expert at all when it comes to this stuff. Any help is appreciated.

Last test showed Download 60.3 and Upload 65.8. Is this normal?