Normal Maps show odd behavior when window resizes

I am trying to use normal maps on my sprites using these formulas:

Set FX NormalMapExtended2 parameter 0 to (LayerToCanvasX(0,mouse.x,mouse.y))/WindowWidth

Set FX NormalMapExtended2 parameter 1 to (LayerToCanvasX(0,mouse.x,mouse.y))/WindowHeight

But when the window resizes the light source changes.

It looks perfect at a window height of about 360.

But full screen does not work at all.

What am I doing wrong?

https://drive.google.com/open?id=1ZTnhOZxR_KO4Vm3tK_PXXizMhUhpVsUJ

Figured it out.

I forgot to mention that I was using:

[EFFECT] NORMAL MAP EXTENDED 1.01

https://www.construct.net/en/forum/extending-construct-2/effects-31/effect-normal-map-extended-1-99975

But what it boils down to is that at the very bottom of the variables list for the effect, there is a WindowWidth and WindowHeight variable that must be set or the light point will be offset.