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$ for i in test{1,2}.jpg; do strings "${i}" | grep 'Dis be'; done
Dis be n imgeeee
Dis be n imgeeee
$ md5sum.exe test{1,2}.jpg
2f76925be1d58fdfaf87f070a130612e *test1.jpg
2f76925be1d58fdfaf87f070a130612e *test2.jpg
It's not modifying the images. That one contains both EXIF and a comment.
Must be some other filter or service of some kind.
Not too sure, just know the symptom and solution, for me, on some images.