parameter scale and offset

When I used Angela-inwhiteskirt-20220820 to create the video, the passed api param scale is 1.9, but it looks bigger than the 2.5 passed in by default on the official website. Why

And how do i determine the value of the parameter offset based on the specific scale

e.g. Why does the offset-Y parameter pass 0 instead of -0.14 when I pass 1.9 on scale

VideoId：e7dac622454c4fce8d3f4ba3786017fa