If your autobrightness is truly off and you didn't install another app that can change it, then something is wrong. There are a few volume control apps that can also change the screen's brightness that I know of. There may be others.
Many "library" apps have a brightness setting.
I have my brightness controlled with macrodroid.
As Mark said, though, if you haven't enabled a third party app to control it, you may have issues.
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