My phone brightness keeps resetting to low (oneplus 6t) [Solved]

Did I set a wrong setting? Cause I checked everything, including the custom brightness on apps. It’s all disabled. The brightness on almost every app is different. The system auto brightness is also off.

Thank you.

This is already known issue. It’s due to custom brightness. If you have custom brightness in any app remove that and restart ratio. If that does not the situation then it’s different issue.