WordPress creates new lines in postmeta table on post update

Advanced Custom Fields doesn’t just save the meta value, it also adds meta with information about the custom field used to save that meta. That’s what you’re seeing.

Meta with the key _nom_adherent and value field_5b759e3860abd tells ACF when using get_field( 'nom_adherent' ) what custom field was used to create that value, so that it can apply things like the “Return format” setting of the field to the raw value, which is stored as the nom_adherent (no _) meta value.

These will only be created when saving through the front end or updating the meta with the proper ACF functions, like update_field(), not just update_post_meta().

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