Landscape tiles appear to be lit differently

Hello,

I am somewhat new to UE4 and have been trying to mess around with some night time lighting effects. My directional light is pointed up(0, 90, 0 for rotation) and the intensity is set to near 0, so I would think that it isn’t affecting the lighting much. For the current lighting I have a skylight, the exposure settings on a post process volume, and the lightmass environment color in the world settings. After all of this, there appears to be this very clear delineation between the different tiles(not sure if this is the correct terminology) of my landscape, where some are noticeably darker than others.

Has anyone seen this or know what this is about? If I set the view to unlit, or light up the area with a spotlight, the issue isn’t there, which makes me think it is in fact lighting related.

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