MacBook screen turns grey and foggy when lowering brightness.
I am using a MacBook Pro Retina 13" on macOS High Sierra 10.13.1.
I wanted to turn up my keyboard brightness with F4 but it wasn't allowing me (it had a no symbol). So I went into settings and deselected "adjust keyboard brightness in low light". This allowed me to change my keyboard brightness.
But when I did this, my computer screen faded to a strange grey/foggy colour. When my screen brightness is in full - there is no issue. But when my screen brightness is lowered, then screen is hazy and grey (it is very clear when looking at blacks). What is happening and how can I change it back??
Also, a flag appeared in my top bar for keyboard preferences. I want to remove this (as i didn't have it before), but am not sure how.
I have inserted a photo of the differences of when my brightness is low and foggy, and high and clear. It is a lot more visible in real life the in the image.