my MacBook turns itself on after shutdown

Hello homayoun288,

Since this is a power-related issue, the guidance from If your Mac doesn't turn on - Apple Support may help even though the issues seem opposite since you cannot get your Mac to stay off. The steps there such as unplugging external devices will help you to isolate where the issue occurs. Below are the applicable steps that might help.

1 Check power connections

Make sure that your power cable is undamaged and plugged securely into your Mac and a working electrical outlet.

If your Mac has no built-in display, make sure that your external display is connected to power, connected to your Mac, and turned on.

2 Press and hold the power button

Press and hold the power button on your Mac for about 10 seconds. (Every Mac has a power button. On laptop computers that have Touch ID, press and hold Touch ID.)

Then press and release the power button normally.

3 Unplug accessories

You could have an issue with one or more accessories or their cables. Unplug all accessories from your Mac, including printers, drives, USB hubs, and mobile devices. Then repeat step 2, above.

6 Reset the SMC (Intel-based Mac only)

If you're using an older, Intel-based Mac, resetting the SMC might help:

Reset the SMC

Take care.

Hi homayoun288,

We would love to see if we can help get to the bottom of this for you. To start, let's make sure that you're using one of the following steps from the resource below to shut your Mac down properly.

Shut down or restart your Mac - Apple Support

If none of these provide an explanation for the behavior you're seeing, please reply with additional details. Are you using a specific app or app prior to shutting down when this happens? Do you select "Shut Down or "Sleep" when it turns back on?

We're always happy to help!

Cheers!