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Problem:
If you're trying to use a Clone field to duplicate another ACF group or field while ACFML is active and set to 'Different fields per language', you might notice that the Clone field does not return using get_fields(). This issue can be temporarily resolved by changing the group setting containing the Clone field to 'Advanced' and setting the Clone field as 'Copy'. Alternatively, deactivating ACFML and resaving the page/post also resolves the issue.
Solution:
We have published an errata that provides a temporary workaround for this issue. We recommend checking the following link to see if the suggested changes help: https://wpml.org/errata/acf-clone-field-set-to-copy-once-does-not-retrieve-values-in-original-language/
It is very important to perform a full backup (files and database) of your site before implementing this action. If your site is live, try this on a copy of the site rather than the live site itself.

This solution might be irrelevant if it's outdated or not applicable to your case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue persists, please open a new support ticket at WPML support forum.