I was having some issues with the 2.4GHz not showing properly

I was having some issues with the 2.4GHz not showing properly, but mine was initiated by having a Spectrum router connected after they talked me into it.  Their router only displays the network name of whatever has been defined by them or requested by yourself, and it decides if it will use 2.4 or 5 GHz. 

The Spectrum router seemed to have limited range compared to my Nighthawk, and it seemed to keep randomly dropping out, so I elected to which it back to the Nighthawk.  The one thing I forgot to do when I switched the internet cable from the Spectrum router to the nighthawk was I forgot to power down the Spectrum router, which was still broadcasting the same network name as my Nighthawk. I could not figure out why 5GHz was displaying under properties of the network, when the router was clearly set for 2.4GHz.  It was also taking a long time to connect.   Then it occurred to me that the Spectrum router was still sending out the same network name as the Nighthawk, and I was connecting to or the other routers with hit or miss internet connection .  Once I powered down the Spectrum router all was working as before.