Strange Display Name for created users

Hi,

I encounter a problem using the Social Login function of this plugin.

I log in with my Facebook account, and then, a new WordPress user is created.
The avatar, id, name are correct.
However, for the Display Name field, I get names like :
Mumudu L. Atuvucosumi
Rimivo J. Iconabitidi
Of course, these name have no relation with my Facebook account and seem to come from “nowhere”.
This is annoying, as this is the name displayed to the user, who may not understand what happens.

If think I correctly specified the Facebook App ID field in the settings.

Somebody to explain me this mystery?

Thanks a lot.

Patric