I have been scratching my head for a while figuring out why this is happening?
Could it be you've simply not updated the render camera view?
For speed reasons the preview render is kind of over-optimized and uses crude simplifications which will result in discrepancies with your final render.
for some reason, I just had to restart TG2...and it worked fine....but I wonder what caused the render to be different then the preview...
Probably your machine had the same thing as King George III for a while. He went mad, and had blue pee.