Pieter

Problem:
If you're experiencing an issue where WPML displays unwanted ACFields despite the "Translation Option" being set to "Same fields across languages", and you have used a specific theme that might be causing this behavior.
Solution:
We recommend following these steps to resolve the issue:
1. Navigate to ACF > Field Group > Sync available and sync the two field groups.
2. Edit the two field groups and simply click on save.
3. Update the post and re-translate it.
This should ensure that the button "background" value will not appear in the Advanced Translation Editor.

If this solution does not resolve your issue, or if it seems outdated or irrelevant to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix,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