Configuration Mismatch

In a TP-link OneMesh network no RE300 parameters can be configures as if these parameters were automatically derived from the router so if I change one parameter in the router the same parameter is transferred automatically to all of the RE300 (I have two of them). There is a funny behaviour. If I remove the repeaters (which according to specs of the Archer C6 are correctly distanced from the main router) the PC 5GHz works ok as if the direct connection to the router had no problems. Now I have reinstalled the repeaters and the PC 5GHz is still working ok but I suspect that this is due to the fact that the connection is still that direct to the router. Unfortunately there is no way of disabling the 5 GHz on the repeaters which I need because of my Alexa 2.4GHz devices. It seems that there is no way out. I wrote a message to the TP-link support but on the ground of previous experiences I have no hope that they will answer correctly to my question. So? Regards

G.Neri