Also, are you using mode 1 or another mode?
Another thing that can mess up the scaling is if you cropped the images in camera and are using mode 2. With mode 2 it will scale until the bottom of the cutout is placed on the bottom red line. If you crop in camera and the exact crop point is not the same every time then with mode 2 the scaling will change based on where the in camera crop was made. So if using mode 2, you typically want to have feet in the cutouts to avoid that issue.