Hi @baysquentin,
The cause of the issue is the WPML Media plugin, it alters the data before getting saved to the database. Deactivating it will not fix the existing issues, you’ll have to edit and re-save them for them to work (to overwrite the corrupted data).
I also turned off zlib.output_compression = Off from your user.ini as it’s causing performance issue since it’s echoing too much warning and notices.
Thanks!