Your sensor has no multi-colour pixels. Every pixel either records red, green or blue. The other colours are "created" by interpolating neighbouring pixels. This means that around the edges you have a problem, because then there are no neighbouring pixels in a certain direction. This is solved by simply cropping the edge off your photo. Your camera may do this cropping differently than the software reading the RAW file, hence the difference.
Then again, this is all very nice and good to know, it doesn't apply to a row of pixels not on an edge. I would go back to the camera store and discuss it with them.
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