Unreal Engine 4.27 Objects looking glitched after building the lights. How to fix this?

Even some areas, which has no texture at all
It’s there even I use starter materials.
New to Unreal Engine, Tried to look for a fix, but cannot find it yet. While searching, thought to ask it as a question. Sorry for not providing any other details, just don’t know which settings to attach with this.Thanks.


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