Art 5&6 don’t move together

Hi. I am from Turkey and we are aobut the finish the robot. But we have some problems.

Firstly, Art5 & 6 motors do not move together. We are using asgard interface. For example If i give a value art5. Art 6 does not move. Is this correct?
Should we use “go all” command or send gcode manually?

Additionally I could not apply art5 and art6 semi differantial system. Should one of gears unsecrewed?. Could you please give me detail. I browsed forums for mechanic problems. But i am not sure to solve.