Trees in distance discoloured

Hi All, usally I get pretty get results using TM, However, I running to an issure with my back ground trees, I twas working pretty well then, I tweeked some setting and there are discloured, I haved tried updated to the 25, then back to 24 wiht no luck I took off any leave tint tried lighting ect. But no luck this is lumen. Here is a befor and after. Ps is is a masive scene like 3km .