I export images using Lightroom, with keywords in the IPTC metadata.
I then use exiv2 to add keywords.
I then upload my images to an online website. The website sees the keywords added by Lightroom, but not the keywords added by exiv2. I can see the keywords added by exiv2 in the windows or linux file explorer, so I know they have been properly embedded in the image.
What might be causing this website to be "blind" to the changes made to the files?