Hi,
the issue here is that your sky material's projection is set to Frontal. For environment, the general rule of thumb is to use the spherical projection for your environment.
If you change it to Spherical and play around a bit with the UV offset/length values, you should be getting your desired outcome (attached in this reply).
Additionally, I would recommend using the Corona Sky object in Shader/HDRI mode or with a Corona Light Material in Corona renders.
I also noticed a bug in your scene with the compositing tag, I will further look into that.
Thanks,
Jan