RPM not uniform, output oscilates

The first flight took off stably. However, after landing and taking off again, the RPM was not uniform and fluctuated, causing a wobbling effect due to the RPM changes.
please help me. why it caused ? how can I solve this ?

The causes and their solutions are described here:

Follow MethodicConfigurator/QUICKSTART.md at master · ArduPilot/MethodicConfigurator · GitHub to get a quickstart.

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pls check
MOT_learn_hover its 2
MOT_THST_EXPO
MOT_THST_hover
MOT_PWM_MAX
MOT_PWM_MIN this param are relevanted to ur motor esc its reduce wobbling.
please tune perfect and reduce vibration on drone

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Thank you. There are quite a few things I didn’t know. It seems difficult, but I will need to study it