Why do Always-on panel turns on when I shut down my phone?

[Aidz]

Please tell us some basic information before asking for help:
Model Name: ROG 3
Firmware Version: 17.0823.2012.122
Rooted or not: not rooted
Frequency of Occurrence: always
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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[Gustav_ASUS]

@Aidz Sorry if I'm not getting your question right, but that sounds like the intended use of AOD. It's supposed to turn on when you put the phone in standby.
You can disable it by going to:
Settings -> Display -> Standy screen -> Always-on Panel -> Off