I had a similar setup, but with FibreX (HFC), and have to configure the WAN to use VLAN10 via the IPTV setting page of the AC68U. This seems to impact the WAN traffic monitoring as you've noted. I eventually moved the AC68U behind the VF Ultrasound (I.e. double NAT) which meant I could remove VLAN10 from the WAN interface, and fixed the traffic monitoring quirk.
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