Flaschcards activity' s scores not sent to LMS

hello, 

I have a problem with a Flaschcards activity (The title is "Droit exclusif ou jouissance exclusive?").

In the setting conditions I chose the option "send score to LMS" at first attemp. I tested it in my LMS but I did not find any scrore. I've already used a drag and drop activity (The title is permis ou interdit?") and I did not have the same problem. In that case, I could find the activity score in my Moodle. 

Could you help me, please? Thanks,

Chiara