My list of registrants is incomplete

Hello,

I'm facing the follwing problem:
The registrants lists for my events (I've setup 2 events) is incomplete.
For exemple for one of my events, when I go to Setup teb / Events menu In #registrants column I could read 41 registrants. But when I go to Registrants tab, the list is displaying only 26 registrants.
The CSV export is not complete either.

Another problem is that in registrants lists, the Event column is empty.

Thank you for your help.

My configuration:
- PHP 5.6.23
- MySQL 5.5.46
- Joomla! 3.6.1
- EventBooking 2.8.1