How do you fix SceneCaptureCube brightness inconsistencies?

I am using a SceneCaptureCube object to create an HDRI cubemap of a map featuring SkyAtmosphere, but I cannot get all faces to render with a consistent brightness. One side (often the one with the directional light in the middle of it, but not always) will appear noticably less bright than the others.
Lemme know if there are other settings anyone might need to know to debug this.
Thanks!