Shader-Graph Normals Not Rendering Light/Shadow correctly

Hi, I have a question regarding ShaderGraph. I've created a basic shader with an ALBEDO and NORMAL map. shown in the image below. the problem is the normals seem to be off to one side.
The Second image shows a standard point light positioned just above a flat plane with the basic shader attached. as you can see the light is only on one half of the plane. If I grab the light and rotate it nothing happens but if I rotate the plane the shadows will rotate with the plane. I think it's something to do with the normal map as the shader works as expected when it's removed. I've also attached the normal map below which is a standard unity type map. blue green top left, red-purple bottom right. have I done something wrong . or is this an error of some type.

thanks in advance.

[1]: /storage/temp/174459-sample-and-normal.jpg