I patch 7 generic RGB fixtures
When i try to change the value the blue channel of the first fixture, it doesn't responde (the same in my led fixture, so no DMX sending on channel 3)

I have a similar problem with RGB Matrix, none channel of the first fixture react (the same in my led fixture, so no DMX sending on channel 1,2,3)
Fixture 1 to 7 UP to DOWN

The problem is the same in edit ou live mode
Software version : 4.12.3
Is it a bug or i have done anything the wrong way?
Thanks