Fan does not stop when nano is shut down

Hi guys I have Jetson Nano 4gb and i got a problem with fan. My fan pins looks like this and after shut down my nano, fan continuous working. So what is the problem?
I really appreciate your help.
Thank you

You have a 3-pin header for Fan, and without PWM pin.
To control the fan speed, find to use 5V 4-pin PWM fan.

Refer this:

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