Seams only in Substance Painter

Grimmolds

it's 8 hours i am trying to fix this.
The mesh is perfectly smoothed (edges)
if i import the Xnormal-baked map in Marmoset, it works completely fine (first image. it get seams on 3DS MAX tangent space. if i obviouslt invert Y, it works).
If i import the same thing in Substance Painter, the seams appear and he bakes them if i export his textures inside Marmoset. And in that case even if i try to invert Y, the seams are still there. 
I tried OpenGL and DirectX, but zero effect. It always sees and bakes seams. Can't find a way. 
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I give up, I am really getting a mental burnout.


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Kanni3d

Substance Painter displays/renders/calculates normals differently than other renderers - if it works in your target engine (marmoset) after exporting, then don't worry about the seams in painter.

LaurentiuN

Check your low poly mesh, should be 1 smoothing group there, where the seams are cut in your UV.