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I've been working on a texture pack recently that makes use of normal maps and specular maps, but i keep getting this weird lighting glitch where half of the block, split diagonally, is lit differently. I am using SEUS renewed 1.0.0 as my shader, I'm in 1.12.2, and using OptiFine 1.12.2 HD U C6
Try a different shader or update your Optifine to OptiFine 1.12.2 HD U C7, that should be the start to discovering your diagnosis. If those don't work, then the solution will more than likely just get technical. Or reload the shader if you MUST use that shader pack for that specific texture pack.
It shouldn't be from your texture pack, if the shader only does it for your texture pack, then maybe the source problem will be from there. My best guess would be that you need more transition lightnings in the texture pack, not sure.
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