Example case: You have SUPER RACING shock absorbers, which offer individual damping force adjustment for compression and rebound. You adjust only the rebound for both front shock absorbers. The effect is however, that the left front shock changes its compression as well.
In such a case, first check if the motor driver unit's cables are connected correctly. If nothing is wrong with the connections, changing motor driver mode (DR MODE) might solve the problem. Please follow the instruction manual to view and modify the motor driver mode setting.
Please read this guide and the instruction manual in the kit: