Using latest ACF PRO 5.0.7 and WPML, I run into a issue with acf relation field when translated with WPML.
I have a field group with 3 relation fields, each looking for different custom post type.
In the default language, admin page is ok.
After duplicate/translate the field group using WPML, all relation fields on the english page display the content of the last one.
When I delete and recreate the english acf field, I goes back to normal.