Weird low saturation/foggy render

Hi!

I am following a tutorial on Udemy to learn how to make environmental renders.
After building the scene, I got some seriously weird lighting in my renders. This issue persists in Eevee as well as in Cycles. The colors (especially in the distance) seem to be very bleak. Further, in the viewport this effect is way worser then in the render.
My Render:


The way it should be:

The materials of the grass seems to be fine - I imported them in the scene presented by the author of the course and they work just fine.
I checked my Color Management, everything alright over there. My Camera doesn’t have depth of field enabled either…anyone nows how to solve this? :frowning:
Thank you!
Greetings, Aschenstern