Yes, you did well to report here bluantinoo, I’m sure many people (like me) will come here for answers, so at least this way they can know that the issue is with WPML and that if they regress to WPML 3.1.8.6, or to ACF 4.4.0 as you suggested, the problem will be temporarily fixed.
It’s WPML fault. In a website where I’m using ACF Pro 5.2.0 and WPML 3.1.8.6, this issue doesnt happen. So I suppose it’s with the new WPML version 3.1.9 that makes this problem come to life.
Instead of regressing to a previous version of ACF, try to regress to WPML 3.1.8.6 and report this issue to the WPML developers, also.
