Yes. I can see that Pin1 and Pin2 are cutoff. But Pin1 is the ground (common for everything actuators, U2D2 and Controller) and Pin2 is VDD (normally 12 V for your case) which is NC to the U2D2 anyway. So you do not have to worry about the U2D2 itself getting hit by 12 V.
Pin 3 is for D+ for RS-485 and Pin 4 is for D- for RS-485. PLEASE look AGAIN at the picture of U2D2 from ROBOTIS e-manual and then look at your own picture. According to your own picture, you put 12V into Pin3 and Pin4.
YKW_R was trying to tell you this before: you need to connect the Ground, D+ and D- correctly between the U2D2 and the actuators so that you can control the actuators properly.
If you don’t believe me or @YKR_W, why do you think that you still cannot control your actuator properly so far?