I went mining and i found a cave which was completely bright, i checked if there wasn't any lava around the area and there wasn't! The hole cave and ravine were completely bright!

How i knew that it was a bug (which fixed it as well haha): I turned down the brightness level to 0 and back to bright (100%). 

In my opinion this is not a big bug that is urgent to fix, but to all the developers out there reading this post take this into account.

(The screenshot only shoes the bug after it was fixed)

Best regards

#HAWK4578