hey !! there I am building a castle thingy, but having this lightning issue. can some one explain what's happening here? #bug

Development Architectural and Design Visualization
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can some one explain what’s happening here?

FireArms - Unreal Editor 20-06-2022 13_39_30
FireArms - Unreal Editor 20-06-2022 13_39_301920×1048 179 KB