H Katohi,
Looking at the image the MB-02V6 at the top right is set up as;
Outputs 2-9" Pullups 5V
Outputs 1,14,16,17: Pullups 5V
Inputs 10,11,12,13,15: Pullups 5V
Common terminal voltage: 0V <---------
Enable source: Enable Chip
D2-D9 direction: Inputs
Looking at the image the MB-02V6 at the bottom is set up as;
Outputs 2-9" Pullups 5V <----------
Outputs 1,14,16,17: Pullups 5V
Inputs 10,11,12,13,15: Pullups 0V
Common terminal voltage: 5V
Enable source: Enable Chip
D2-D9 direction: Output
So, I'm assuming that the bottom bob is driving the G203Vs? If so the common is set to 5V. This is incorrect, you need to set it to 0V as the G203Vs use positive logic. Also the outputs pullups need to be 0V as well for the same reason.
Cheers,
Peter