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The SDK software reports the image coefficients which are 0, because the streams are rectified: https://github.com/IntelRealSense/librealsense/wiki/Projection-in-RealSense-SDK-2.0#d400-series. The calibration sw shows the calibration coeffs for the unrectified images.
Regarding your question why focal length and principal points do not match:
The calibration software is reporting the intrinsics for the 1280 x 800 resolution for the Y16 (unrectified) format. If you use the rs_sensor_control.exe example, you will see that you cannot retrieve the intrinsics for this resolution and format. The rs_sensor_control.exe example gives you intrinsics for rectified image, which will be slightly different.
You can use the utilities described in this webpage (https://github.com/IntelRealSense/librealsense/wiki/Projection-in-RealSense-SDK-2.0) to do your projection and deprojection without having to use the unrectified parameters.