Normal map noise problem

I am trying to create a Borderlands game-ready character, and I decided to use normal maps to preserve details from my high-poly model. It worked good, except for one thing: these strange curved lines. I Don't know the cause of them. 
I made them with can see those lines in the red rectangle in the second image. 
They appear with every shader I use, so it's not AiToon fault. 


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