If it's connected via traditional (a connection for each control surface), make sure that the Naza is also set to traditional in the RC tab.
I would recommend that you use S-Bus though. It's more robust and the Naza handles it just fine.
You see the RSSI in the telemetry screen of your Taranis but it sounds like it's bound from the colour of the lights.
Double check all of your Taranis settings. If the connections from the X8R to the Naza are correct then it's going to be a setup issue.