Hello,
I’m sorry that you’re running into this issue, but I’ll be happy to help you out.
Do you have a staging environment set up? If so, can you try switching to the Twentyseventeen theme and disable all plugins besides The Events Calendar, Events Calendar Pro, Event Tickets, and Event Tickets Plus and see if you are able to recreate the issue there? If not, then there is likely a conflict with something else on your site. You can determine the source of the issue by running through the steps outlined here. I do see that you have several Event Espresso plugins enabled, so I would recommend starting with those in your testing.
Please let me know what you find!
Thanks,
Jennifer