I've applied some fix into this following files.
JoomlaFolder/media/com_easysocial/apps/fields/event/title/title.php
JoomlaFolder/administrator/components/com_easysocial/models/clusters.php
It should work fine when you create recurring event from backend.
Frontend work - some small sugesstions on this: add the date infront of the Eventname - and add the Date as well to the mother event to create a completed look and feel ;-)
Thanks for your suggestion Kai
Perhaps you can submit this suggestion on our forum Easysocial feature request page here
https://stackideas.com/forums/easysocial/feature-requests-2 so we will see if there a lot of user request this as well, we will definitely consider add it as an option so user can decide display date before/after beside the event title.