Hi,
Sorry for the issues. I can help out.
I visited the site and see the ticket form under the Details, Organizer, and Other Section.
Are you seeing it now? Did you have a start and end sale date for the tickets? If the current day is not in the range it can cause the ticket form to not show.
We have this guide to moving the ticket form if you would like to move it somewhere else on the single template:
https://theeventscalendar.com/knowledgebase/moving-the-ticket-form/
Let me know what you find out.
Thanks