Thank you for the reply.
I am talking about the left part of the image where its empty.
The images I uploaded are different, one is interactive render 25 passes and
the other is VFB render with 35 passes 3% noise.
The VFB render is not so smooth, you can see like gradients
and each one is getting darker as you look up towards top of the image.
Its more noticeable at the top part of the image above where I typed VFB.
As you look upwards as the image darkens.
Im not sure if its supposed to be like this, maybe it is, only it does not look nice.
But in the interactive render the transitions from lighter to darker is so much more
smoother, barley noticeable compared to the VFB.
I created in photoshop a comparison with the 2 right next to each other. Only the left side of the 2 images
and I painted over with a blue brush where each different transition begins.
I don't have bloom and glare enabled and have not touched sample intensity, I don't know where it is in corona or what it does.