Get rid of vignette effect

Hi all,

I am working on a project in 4.18 generating cubemaps by placing 6 cameras manually in order to stitch the resulting images. There was a very dim vignette and other effects like lens flare I wanted to remove. So I found the PostProcessVolume of the project and disabled them. However, a more intense vignette effect can be seen on the images taken by each camera. I would appreciate if someone could tell me what this effect is caused by.

Find attached info of my PostProcessingVolume and example images of what I refer to.

Post Process Volume:

Resulting images:
With the undesired vignette effect:

The image before touching the PostProcessVolume, without the vignette:

Thanks,

have you checked the post process in the cameras themselves? cameras have a built in set of options which is the same as a post process and can override the scene.

It looks fine. I am pretty lost with these and cannot figure out what is happening.