Custom taxonomy custom field not translated

I have a problem in translating a custom post type that uses acf for selecting a term from a custom taxonomy: when I translate the post, the taxonomy select has not the right term selected. Here an example:
I have a custom post type named pens. I create a post named Pen and I select (with acf) the taxonomy penscategories “Retractable pen”. Please, notice that I have already translated in french this particular term with “Stylos rétractables”. When I create the new post in french by clicking on the little plus next under the french flag, every other fields is correctly filled. The select where you should choose the pen category is not correctly set with “Stylos rétractables”, but has the first option in alphabetical order selected (“Crayons et micro mines”).

Can you help me please?

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