Hi, Model is RE305, Ethernet link speed on the computer with utp cable is 100 Mbps, but speed test says 20-25 Mbps, but smartphone on 5 ghz have 40 Mbps download with speed test, this is weird on so...

How is it possible that on 5ghz network, (when connected to ac1200 wi-fi range extender) smartphone with speed test have 40 Mbps download, but on UTP cable only 10 Mbps download and with usb wi fi...