Bldc motor and motor driver problem

Hi everyone, I have question about hall effect sensor. This year I designed bldc motor. I have kellykills-M-N-user manual 2. 5 motor driver. And now I tried the motor with kelly motor driver and right side is okey but when drive left side the motor knocking. The both motor is same and the both motor driver same. When I change motor driver and motor configuration (I mean I tryied left motor and right motor driver, right motor driver and left motor) I saw same motor had problem. İn your opinion what can I fix this problem? I hope my motor is healty