Strange Lightmass behaviour - Brighter color on the edges


This is my problem:

As you can see there are several question that come to my mind:
Why lightprobes are so white on the left? (Everything affected by these probes become overexposed like the camera gizmo)
Why the little balls don’t fill the lightmass importance volume in its entirety?

On the right you can see the settings i used, they are mostly default cause i wanted to block some lighting in this level.

It’s on preview quality, but also on medium it’s the same.

How to solve this?
Thanks, Alessio

[TABLE=“class: WRD”]
[TR=“class: even”]