Before I ask my question, the form asks for the hardware version and the options are V1-V20, but my router hardware version shows: Archer AX21 v1.20. So which one should it be?

Anyway, I'm puzzled and can't find the explanation of how the Tether app shows the devices. I have two AX21 routers, one acts as a primary router and the other as an AP. The Tether app shows one cloud device  and one local device and neither has a matching MAC address of what I see on the admin page. The cloud device's MAC address is almost the same but is off by one in the last (right) digit. Any idea what is going on here?