I hate to interrupt your discussion, but I can offer you an explanation.
The short of it is that size doesn't matter (ahem...). Your higher-resolution pic in the example is actually "wrongly" rotated, as it appears in the thumbnail. However, it includes an EXIF tag specifying the correct orientation, that is, 90 degrees clockwise from how it is encoded in the file. Some programs (in fact, most programs) display it upright because they read the EXIF tags and rotate the image for you. However, strictly speaking, the picture is with the wrong orientation.
So, the problem has nothing to do with OCC or other sites. If you want to really fix the orientation of the pics, open them with a program that allows you to choose whether to follow the EXIF tag instructions or keep the real orientation, then rotate it and re-save it.
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