Why do I have two wires for each zone?

I have been watching installation videos and when I check my control unit it looks like I have two wires in each zone vs. One I see in all tutorials. What gives?

Maybe someone took their 16 zones and put the on a 9 zone controller? If you disconnect one wire from the controller’s zone 1, run it for a minute, reconnect, disconnect the other wire, does it water the same or different area?

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I would recommend getting a 16 zone Rachio if they doubled up as I suspect. Even if they did not for some reason, I would rather have too many zones instead of not enough. It LOOKS like a simple conversion as it does not appear to have a sensor or a master valve / pump. I am guessing the far-left blue wire on the orange terminal is 24VAC IN which you would not use on the Rachio if that is the case.

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