Hey Remi,
I’m afraid that tickets do not support recurring events at the moment. In other words, tickets for a recurring event will be created for all events and share from the same stock where a ticket sold in one event is sold on the other events as well.
The good news, however, is that we have this feature in the works and are planning it for an upcoming release, tentatively for Event Tickets Plus 4.2. You can follow along with the feature request here and be notified when that releases.
Sorry for the trouble, but does this help shed light on the issue and answer your question? Please let me know.
Thanks,
Geoff