The first issue I see there is that you are using sRGB for your normal map. You need to change that to non-color data. Never use sRGB for normal maps. Once you change the image texture to non-color, it should correct the issue. If not, then it could be the way they were exported, but that's a known issue with sRGB being used for normal maps. In fact, you should ONLY use sRGB for albedo or color maps. Never for any of the other PBR texturing maps.

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