Robin2:
I suspect it may be because the JPG has Exif data.
Correct. Location Exif data (e.g. longitude + latitude) for certain. I suspect personal data (e.g. human name) is also a problem.
The Exif data can include enough detail to know the rough location within the room within the building. Unless that location is a studio / business and you are professional photographer it is a good idea to always strip that data before publishing to the world.
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