Monsterborg PS4 Controller Axis Assignment

I recently purchased a Monsterborg kit, order number 231858. I carefully followed all directions during assembly. My problem is that when using a PS4 dual shock controller, only the left hand stick appears to be operational and the monsterborg will only go forward and in reverse. The right hand stick to make left or right turns does nothing. The PS4 controller is paired successfully and the test script "jstest" shows responsiveness in both controller sticks. I have also edited the "MonsterJoy" script to change the button slow to =6 and the button fast turn to =7, per instruction in this forum. I have tried 2 different PS4 controllers with the same result. I am wondering if additional programming is required to make the PS4 controller functional. Please help! Thank you.