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Looking at the images it appears you have two cameras with long focal length/high zoom. What is also readily apparent is that they have only a very small area of overlap, as the small "IDS box" is on the far right edge of the left camera image and on the far left edge of the right camera image. Valid distance (and calibration) data can only be estimated in the area of overlap, so stereo calibration might fail because of this small overlap (I'm actually surprised that it allowed you to optimize at all, as normally the "calibrate" button only becomes enabled when enough image area has been sampled).

I'm not sure if and how stereo calibration can cope with rotated cameras, so I'd recommend to rotate them before feeding them to calibration (or rectification later).

Note that calibrating both cameras standalone allows for rectifying their images, but not for proper stereo computation as there is no way to know the transform between both cameras in that case.