motors are not running simultaneously using Arduino with UART

[nitzerebbs]

Variant

USART

Control type

FOC

Control mode

Torque

What is the bug and how to reproduce it ?

Hi,
Thank a lot for the great firmware !! ;-)

I am using an Arduino to control the motors (USART mode). I configured the right UART because it has a 5V tolerance.
However, I have the problem that the two motors do not always run simultaneously. The left motor (with the longer cable) usually runs a little slower or sluggishly.
Has anyone else had the same problem or have any tips for me?
Thank You

Regards JJ

[nitzerebbs]

additional information:
I do not use the steer option in the input command (steer 0) and I already tried to change the controller and the affected motor.