Hi Sebastien,
Thanks so much for reaching out!
We are currently experiencing a high volume of threads and will get back to you shortly with a more substantial response if necessary.
In the meantime, do you see the same results if you switch to a default WordPress theme, like ‘Twentyseventeen’?
As a first troubleshooting step, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
Let me know if anything else comes up in the meantime!
Thanks,
Jaime