This can happen when you have chosen an aspect ratio within the camera menu, that differs from the native aspect ratio of the sensor. Could that be it?
Typically: with camera JPG the camera will hard-crop the processed image that it makes, to this user chosen aspect ratio; but with camera Raw (if implemented at all) this is just a soft crop. So you will then have the opportunity to reverse or change it - all of the sensor's picture coverage having been included in the file you've imported, regardless.
Otherwise, the application of lens (geometric) corrections or automatic levelling (for example) can lead to a reduction from the overall 'Raw captured' image extent.
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