Macbook pro brightness problem

my macbook pro contantly change brightness after turning off and on the computer. even though i uncheck "automatically adjust brightness" in System preferences-Display, it still changes after turning off and on the computer. anybody else having the same problem, any advice?

Thanks for the advice!
When i move my hand towards the build in camera nothing changes, the brightness remains the same, its only when i turn my computer off and on it happens. When i turn off the electricity and run my mac on battery only nothing happens, brightness remains the same.
It seems like every time i turn my computer on it automatically adjust to the light in the room, but only at the time when the computer is turned on, not at any other time.
how I discovered this was by watching the bar in "system preferences - displays". I repeat that i have unchecked the box "automatically adjust brightness".

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