peterS-20

Problem:
Setting a custom taxonomy to Translatable may create duplicate terms in other non-translatable taxonomies [Appended with a language code to their slug]

Solution:
This is a known issue please see the status and solution here https://wpml.org/errata/setting-custom-taxonomies-to-translatable-may-create-duplicates-and-append-a-language-code-to-their-slug/