Kresimir

Problem:
If you're experiencing issues with translating ACF repeater fields registered via PHP using the WPML editor, where the field doesn't translate correctly and only shows the number of rows instead of the array, this might be similar to your situation.
Solution:
We recommend trying the workaround mentioned in the WPML errata for issues related to the translation preference of PHP registered system fields. You can find more details and steps on how to apply this workaround at Advanced Custom Fields local fields translation preference issue for PHP registered system fields.

If this solution does not resolve your issue, or if it seems outdated or irrelevant to your specific case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the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. Additionally, please feel free to open a new support ticket for further assistance at WPML support forum.