Normal maps require synchronization between the baking tool and the rendering tool to avoid showing seams. http://wiki.polycount.com/wiki/Normal_Map_Technical_Details#Synched_Workflow How was the normal map created? What are you using to view the model?
what eric said on top, i would suggest you straighten your uvs more. it is not the cause of your problem, but you lose a ton of texture space with these curved uvs. on top even with 3d painting such a substance painter, some strokes are still easier to do in 2d space and then the curved uvs are way harder to edit. Also…