3th harmonic in BLDC

Currently I am verifying the movement of my H-bot system using ODrive.
From the power spectrical density I read the frequency that is reproduced by the system, which is perfect. However, I found a third harmonic vibration. To find the cause of this I did some research and I have concluded it could be caused by controlling the BLDC motors. By controlling the motors differently a third harmonic is not necessary.

Does somebody know whether the ODrive controls the motors in the way it suppresses a third harmonic vibration? When that is the case, I have to find another reason why the third harmonic exists.

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Do you know the frequency of the vibtation.
In a BLDC drive are many different control loops and a PWM at different frequencies

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