Wierd White or black stipes on my static mesh

Development Rendering
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Help Please

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I’ve been making a room in UE4.24 and all the GI ,Skylight,reflection probe and Lights are working properly as they should but there are some weird white stripes on my static mesh(room). Please have a look and tell me what to do.

I’ve imported this from blender and when rendering in blender using Cycles there was no such issue.

Please help as it is making my project ugly !