REX Sky Force - why green ground color?

Hi,

I installed REX Sky Force (no issues with the installation or software). The only thing that I do not like about the product is the strange green color that I see allover the ground if I unselect Enhanced Atmospherics. The only way (for me) to see the sky and clouds colors selected from the REX SF settings is by unselecting Enhanced Atmospherics, which I do at dawn and dusk to avoid the ugly P3RD yellow-ish clouds. Is there a way to set REX SF to prevent the entire ground from turning almost to a cartoonish green when Enhanced Atmospherics is not selected? And why does the ground change when REX SF (I thought) is a software designed to change the colors of the clouds / sky? I hope someone can help - thank you.