Landscape Bug

Hi,

i have created my own landscape in the editor, set some materials and everything is fine, until i found this :

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i tried building the lighting, deleting the components and adding them, but nothing… please help

actually i tried couple of things, remove a component and add it again, but it didnt solve the problem. however, messing with the skylight, i noticed changing it to movable, or deactivate its shadow casting, did solve the problem.