FYI, and for anyone who finds this thread in the future, it is most likely an issue of which type of rotation was done. There are two kinds:
1. EXIF tag rotation. The image is not changed, but a small piece of data is added that commands programs that display it to rotate it before displaying. This is done automatically by modern cameras and phones.
2. Actual rotation of the photo. The pixels are each repositioned so that it is rotated.
Some programs (such as the back-end to this site and the web browser that you use to view it) may or may not obey EXIF tags, so things can get confusing. When you run into this issue in general, the solution is to use a program that actually rotates the photo, and also use a program that strips EXIF metadata.
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