Lightroom: Fuji x10 Raws show less of the picture than the jpeg

For wide-angle shots, the Fuji in-camera lens corrections (for the camera JPEGs) changes the aspect ratio of the image slightly. I don't know the reason for this, but I suspect it's a glitch. This results in image renderings that are slightly taller than wide, and results in slightly more image area shown.

For example, if you take a picture of a square head-on at the shortest focal length, in ACR/Lightroom and the Fuji desktop software, the result will be a square (same # of pixels wide as tall). However, in the camera JPEG, the square will appear as a rectangle that is about 5% taller than it is wide.

Dear Eric Chan,
many thanks for your answer. It was one of the possibilities, I thought of, that it might have s.th. to do with an lens correction in jpeg. But I thought, the jpeg was made of the same shot as the raw, so how can it show more?
Do you know if one is aware of the theme at Fuji?
Thank you and have a nice day/evening
Uwe Sasse