Hi Gonzalo,
Thanks so much for reaching out!
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/
Can you also take a screenshot of what that event looks like on the backend for me, so that I can try to replicate things on my end?
Let me know if anything else comes up in the meantime!
Thanks,
Jaime