Why my jetbot can't go straight?

After i use jupyterlab and connected to text my jetbot,i use those basic code to make it go straight ahread:

from jetbot import Robot
robot = Robot()
robot.forward(5)

but it always trun to be go right a little bit.i thouht maybe my motor get sth wrong,so i change the motor but nothing changed.I got the voltage of the motors,its different,left one’s voltage is about 5% higher than the right one,And i try this on my friend’s jetbot,things are the same,is there are anyone used to got this problem?and how to solve it?or…ignore it?(i think if this problem can’t be solved,my jetbot may can’t obstacle avoidance or anything more comlicated )

Suggest to find the answer from Jetbot github.

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