I’ve just checked it again using WPML and it seems that WPML is duplicating the last ‘tr’ element on the page and adding it’s meta box (language switcher).
The problem is that this duplicated tr contains all the ACF classes, so ACF thinks it is a WYSIWYG field. This is why the JS fails.
Can you please contact WPML and let them know that they should use a clean ‘<tr>’ element to avoid conflicts with 3rd party plugins. ACF is not the only plugin that appends extra form inputs to the category edit page, so it would be in WPML’s best interest to fix the issue from their end.
I hope this makes sense 🙂
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