It's not a bug, just the limit of the map. From certain resolution, some maps can't fit the width of the screen. For example, if the map is designed with a 1600x4650p, unless you set your game windows size to a value equal or less to that, you'll see black edges. So, maybe you have it configured like 1920x1080p, then if you get to the middle of the map, you'll see (1920-1600)/2 = 160 pixels on each side!
Maybe in the future this will be tight, but definetly not a bug :Smile: