Simple issue with exposure component

Hello Everyone!

in the meanwhile Ladybug will be developed for Mac users, I was carrying out some basic basic sun exposure exercises.

Somehow though I cannot understand why the result I get is like that. The picture shows the problem. I evaluate the mesh in the exposure component with themselves as obstructions as well ( I tried also having them separately), and if I plug in the gradient component to see which mesh points are most exposed, the result is definitely not what I would expect.

What am I missing? thanks

the gh file is attached

Lorenzo