Landscape Material | World composition

hey guys. i have faced a problem i couldnt solve right now. maybe u can help me out there.

i am working with the world composition tool , my “dummy map” works fine with a landscape Material and their attributes
but when i add an adjectand landscape level like this :

it appears in the editor like this (dont mind the foliage tree spawner):

the left one is the dummy level that works fine and the other one is the newly generated. my question: why is it darker when its the same Material and does not generate the material attributes?

i have to create levels like this to use the sculpting tool properly , is there something i can do about this?

repainting did the job