Randomly max brightness when display gets turned on after inactive off?

Am I the only one who are experiencing it? When I set the screen brightness below 5%, and leave the computer so that the monitor goes off due to inactivity (I disabled inactive sleep, so the computer keeps running). Then, I turn the screen back on by moving the mouse, randomly the screen becomes max brightness.

The brightness value on the OS is still the low value, but physically it becomes the max brightness, and I have to change the brightness. It’s a laptop with an Intel iGPU (no discrete) and I am using BIOS mode, not UEFI, because keyboard backlight does not work under UEFI.