If you don’t need to translate the field groups, then you need to set the “Field Groups” Custom Post Types translation to “Do Nothing” on WPML -> Translation Management page.
The problem occurs because ACF saves field groups and their fields as posts. If you translate a field group, then each language will have their own field group settings.
For that kind of situation, I suggest you register the fields via PHP code instead. This page should give you more idea about it: https://www.advancedcustomfields.com/resources/register-fields-via-php/. That way you can take advantage of WordPress’ localization feature. This page should give you more idea about it: https://codex.wordpress.org/I18n_for_WordPress_Developers.
I hope this makes sense 🙂
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