two sided indirect lighting issue

Hi,

I have 2 objects from the unreal demo and they are not correctly lit.
The material editor is doublechecked and the light is not to dark.
Both objects are static. Skylight has a Hdri in it and is set to static.
Directional light is stationary.

Any ideas why this could happen ?

dadf1edc3677a4fb9996accf1d96db963ebd3b54.jpeg
0f4eeb60f4f97aabe0747bc28b971fff45824a62.jpeg