Brightness keys functioning differently [Closed]

I own a HP Pavilon 15-R036TU Laptop.
The brightness up and down keys are functioning alternatively,means when I press the brightness up key it is decreasing the brightness and when I press the brightness down key, it is increasing the brightness of my laptop.
What could be the problem and what I need to do in order to resolve the problem.

Please help.

Waiting for your response.

Thank you.

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