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As pbodymind pointed out, those images seem rectified, at least the part corresponding to the inside of the chessboard. But according to your description, you are using only that one pair of stereo images for calibration, aren't you? (That would explain why the squares on the chessboard are perfectly aligned on the undistorted images, but the borders of the paper sheet seem to be bent)

Using only one pair of stereo images for calibration is not enough, to get a good calibration you need to take many pictures of the same chessboard in as many different positions and orientations as possible.

The resources mentioned by pbodymind will help you to understand better stereo calibration.

Good luck!