Unreal Engine 4 difference in lighting game mode too dark

Hi there, when I press G while in the Editor the screen darkens a little.
When I got out of G mode the screen brightens a little…I have done enough research to find no answer so far.

I tried deleting the post process volume/disabling it and removing the post process from the editor as well but it still appears. Why is this happening and what can I do about it?

Duplicate: Unreal Engine 4 difference in lighting game mode too dark - Community & Industry Discussion - Epic Developer Community Forums