Coldrag

Hello guys, im new in 3D coat and have a problem with my normal map. I try it since 2 weeks to scullped my mascot, retopo and render it. But if i render it in blender it gets deep crater and quadrangle on the mesh and i have no idea why. I watched the videos about normal mapping and expording in 3d coat but nothing works. After retopo i create my uv´s and choose merge with normalmap then i export it in under file as fbx or obj ( yes i tried the other ways to export too = same results ). What am I doing wrong ? Hope someone has a solution for this problem. ( sorry for my bad english i hope you understand what i mean ) Thanks in advance. rendering from blender rendering from blender the 3d coat version after retopo and painting