The lightmaps become darker during gameplay.

Hi!

I am making a mobile game in unity and I am facing issues regarding the lightmaps/lightmap baking during development. When I bake the lightmaps everything is ok and I run that scene the lightmaps show up perfectly but when I instantiate the same environment during runtime in another scene than every thing that was set to static become dark and only a little part of it is visible.

I have gone through many answers on this forum and many others but couldn't find a solution so I decided to ask you people this directly. I am attaching a screenshot of the game during runtime too:

I have already scale the objects independently in the lighting window. Messed around with the settings a lot. Made a new scene too, baked it, nothing happened.

Any help or suggestions will be great!