Good evening Joachim and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about things not working as expected on your site.
I would love to help you with this topic.
The first thing I would recommend, if you have not already done so, is going through the following guide step-by-step: https://theeventscalendar.com/knowledgebase/new-user-primer-event-tickets/
Once that is done, 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/
If the ticket is not showing on the page, that sometimes can be caused by the use of a start sale date.
The tickets will not display until that start sale date is met. This is normal behavior.
Would you mind sharing a screenshot of your “Edit Ticket” screen ?
Hang in there!
Geoff B.