Node Previews wrong display.

Hello everybody,

Right to the point, this is my problem. The shader on the mesh looks perfect, but the preview on the nodes which complicates me to get an idea about how is going to be the result.

I have bought Shader Forge this week and I have Unity 5.4 recently installed.

Thanks for your help.

Have a nice day ^w^

P.D: I searched on the forum a problem similar to mine. But I haven't found it, if somebody knows about that I would appreciate to have the link.