Brighntess isssue w Hyperpixel4 square non-touch

Hi, I recently bought a Hyperpixel 4 square without touch capapbilties, which I want to use on a Raspberry Pi4 with the light OS. I followed the installation which works so far. The only issue I have from the beginning is, that the left half of the screen has the correct brightness, but the right half is brighter (see images), from the moment I turn on the raspberry and the screen. Each line is devided at the same pixel and the difference is slight but apparent. I double checked the connections but they are ok. Is the display defective, or is there a setting or similar, that I overlook? Any help appreciated. Many thanks, C

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