OK, solved my problem. I don’t know if this is the same as yours, but will write my solution anyways. I am using WPML and ACF.
When duplicating/translating my field group to the second language, it couldn’t find and match my clonefield settings choise on the other language – even though that the clonefield field group itself was already duplicated/translated to second language – resulting in “Unknown” as setting.
The clonefield it self is only shown by conditional logic, and when it had “Unknown” as clonefield settings choise, it resulted in a JS bug, as you describe.
When changing the duplicated/translated field group settings, so that the clonefield now looks at the duplicated/translated clonefield field group, it all works.
🙂 Rasmus
