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Pixel Shader 3.0 unexpected results

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Just when I think I understand shaders they throw me a curveball every time.

This seems SO simple. I have a Vector 3:
pos=new Vector3(1024,1024,1024);
and a shader constant float3 EyePosition
I assign my Vector3 to my shader constant just before the draw call:
[font="Consolas"][size="2"][font="Consolas"][size="2"]This variable is not used or altered anyplace else, in either the program or in the shader.[/font][/font]
[font="Consolas"][size="2"][font="Consolas"][size="2"]BUT, when I debug the pixel shader in PIX it shows EyePosition= (414.855, 823.112, 1024.000, 0.000);[/font][/font]

[font="Consolas"][size="2"][font="Consolas"][size="2"]Can somebody please explain to me WHY (tF!) my constant is getting changed? Is the interpolater being invoked for some reason? I hate asking dumb questions but I can't see any logical explanation for this whatsoever.[/font][/font]


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