MCO switches not syncing

I have MCO single and double switches. each MCO will create two devices for every button. the main device and a sub device where you usually ignore. my problem is that the physical wall switch is syncing only with the sub device not the main device. so if i switch On/Off from the wall switch, only the sub device will turn On/Off but not the main one.
any idea what might cause this please or how to fix it?

many thanks,

Shady

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