I think this is due to the fact you're using all 6 buttons on the left and the sensor is catching some of the backlight. On another thread, someone said it doesn't seem to be a problem when using the Up/Down buttons. I've noticed it's a problem on the fan control, which seems to have a bottom backlit button as well. I think it may be a design flaw. With my engravings came a bottom ambient light bar that had a piece of black plastic instead of clear. I believe this is provided for this specific purpose. I literally just tested this and noticed it blocks most of the light. I had to put the flashlight of my phone directly up to the sensor to get it to saturate. With the clear bar, it would max out depending on the color of my backlight. If I used a red backlight, the sensor seemed to work normally. When I used an aqua backlight or white, the sensor was saturated.