Substance Painter smart mask messed up after reimport mesh and maps

Alright guys,
I am experience this issue every time I reimport the slighty changed mesh.
So here the smart mask (dirt) is as it has to be:

 This is the same smart mask after reimport the same Mesh:

Do I something wrong on the reimport process?
Is there some setting to do?

So I hope you can help me, this behaviour is driving me crazy:D