Two IW format images at the same location are offset and cannot coincide

I process two images through this process(date 20151111;20161012)
read-Apply orbit file-thermal noise removal-calibration-ellipsoid correction GG-liner to from db-write

I’m puzzled that a large deviation has occurred



Both images are in IW format,there is no offset in EW format.
Is it the imaging problem or did I handle it wrong?

I process two images through this process