figures got chopped when saved using "print"

Hi everyone~

I plot some figures, and save them to .tif file using "print"

But it often got chopped.

I use the code

set(gcf,'Position',[50 100 1200 500]); % set figure size on screen
set(gcf,'PaperUnits','inches','PaperPosition',[0 0 6 3]);   % set figure size for print
print(gcf,'-dtiffn','-r600', name);

Can somebody tell me: whether

set(gcf,'Position',...);

interferes with

set(gcf,'PaperUnits','inches','PaperPosition',...);
?

Why my saved .tif is cropped? How to avoid?

Any thoughts are appreciated. Thanks~