Events+ and multilanguage websites with WPML

Hi,
I'm using event+ with WPML to translate events on a multilanguage website.
All works great but it seems that RSVPs are not linked to the main language.

If i answer "I'm attending" in one language, it is not saved in other languages.
RSVPs are different by language.

RSVPs should be the same for each language because it is the same Event translated.

Any idea how to fix it ?

Thank you
Dimitri