SkyAtmostphere backdrop doesn't cover horizon

So, simple really, I just watched a video from unreal on youtube about the SkyAtmosphere lighting solution. It looks weird to me though. When he does it it looks absolutely stunning, but when I did exactly like him, it doesn’t. List below.

SkyAtmosphere differences:

  1. Backdrop doesn’t cover horizon, there is a black line.

  1. Volumetric clouds look weird. Specifically when moving the position of the sun to sunset.

Now all of this makes his video a lot less satisfying and I’m not tech savvy enough to figure this out. I’m no pro by any means, I only occasionally build levels using asset packs and stuff from the marketplace.