Weird dark textures on bottom side of the mesh

Dark textures on bottom side of the mesh…I’m getting this artifact all over my meshes , can’t find a good explanation why and how to fix this, please help !

Could it be that the lower hemisphere color of your skylight is set to black, as I believe is the default value?

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Some how the problem is with skylight set as movable , i have changed it to static and rebuild the light and everything turned ok.

Please promote it to answer for future users.