DHCP Issue, wrong MAC Address

Question

SFOS 16.01.2 
 I dont know why, but XG is detecting a second MAC from two smarth phones. 
 One is running on Android and the other on Windows 10, both device are only equipped with one wifi controller and this means only one MAC Address or I'm wrong. 
 To control internet access, both devices are setup as MacHost, no Sophos Client available on Windows 10 Phone. Any idea why XG is detecting two MACs from each device? 
 
 Thanks Karl

Karl-Heinz Heß · Answer

I found the issue. 
 The TP-Link Wifi Repeater is chancing is front part of the MAC Address and causing my problem. 
 Just in case someone else is running into the same issue. 
 Karl