Network connection 2 times with different mac address
So while having another wifi related issue with my wifes phone not working on the network i open the xfinity app and before i get to her phone i notice 2 tcl roku devices connected to my home network. I had priviously set the tv up on a static ip and reserved that ip in the router, so as i look at the connection details i see that both devices have the same static ip address and it is correct as far as the networking setting go, as i scroll down i see that they both have different mac addresses. As soon as I pause the device connected with the wrong Mac address my wife's phone starts to work again, and I mean as soon as I hit pause device her phone beeps with a notification alert. We live in the sticks and cell coverage is all but nonexistent without wifi connection, so the 2 seem to have a connection. For months we have been getting hacked with ghosts network signals that mirror our every setting in channel bandwidth, frequency rssi value always 1 of the ghost signals 1 point below and the other 1 point higher then our own network. Our data plan gives us up to 1200 download and 35 upload and after running speed tests someday have had 120 or less download and even higher on upload.
I am not a technical person have just started to learn the subject after months of cyber harassment. Anyone with ideas or insite please speak up