Hi Jerry,

it's the design of TotalMix FX that "audio from the computer" is not directly sent to the HW Outputs
but to the middle row, called "SW Playbacks".

This makes it possible to create very flexible submixes, as every HW Output (bottom row)
has an individual routing/submix of channels from top row (HW Inputs) and middle row (SW Playbacks).

To your question: The application only sees "output channels" as presented by the driver:
    Analog 1-8, Phones 9-12, AES, ADAT 1-16.
The application does not know about the separation of outputs into "SW playbacks" and "HW outputs".
This is a TM FX feature to be able to create those very flexible submixes, as mentioned before.
Therefore, the SW playback channels carry the same names as the HW outputs.

To your situation. If you are using channels/instruments in your DAW and send their audio output
not only to the DAW sum but to individual outputs like ADAT1 .. ADAT16,
then you see the from you mentioned metering in TM FX middle row SW Playbacks ADAT1 - ADAT16.

Routing to the "real" (physical) HW outputs (TM FX bottom row) is a second step from there.

To inspect or modify a routing for a HW output is easiest to be done in the so-called "submix mode".
This is the default operation mode in "mixer view", check that "submix" is enabled in the light blue field on the upper right.

The steps to check/modify a routing are always the same:
1. Select a HW output channel.
    Once selected, you will see its name appear on the bottom of each fader of top and middle row.
    This indicates that the fader positions of top and middle row show you what channels are routed to the selected HW output.
2. Option: move the faders of top and middle route to change the routing.
3. Option: do not forget to save the changes to one of the 8 snapshots if you did some changes, that you do not want to loose.

To sum up, SW playbacks and HW Outputs carry the same number of channels and the same names by design.
Its a TM FX feature, that you have the middle row to allow for more flexible routing per physical HW output (bottom row).

The Software / DSP mixer TotalMix FX is only for controlling the interface, it is not in the audio flow.
Here you are free to define custom names for all channels in Top, Middle, Bottom Row.
With the button "Names" on the right side in the light blue area you can toggle between default names and user defined names.

To change a name, there are two ways
a) by double clicking a name or
b) by using Options -> Channel names which offer you even more options in terms of visibility of channels in TM FX or by giving channels a color.

I hope the explanation from waedi and my additions make it clearer to you.
BTW, I saw your web page, interesting things that you are doing

Thanks Ramses for the explanation.  I love the way TotalMix is setup, allowing me to make independent mixes for speakers, headphones, and output to DAW or recording to CD. Great flexibility there. I am aware about the ability to change the names of the all the channel, now I understand why it's best to ignore the "ADAT" next to the Playback section the Channel Layouts. 

Jerry
https://www.jerrygerber.com
https://youtube.com/@astromusicvideo/videos