Hi Kelsey,
I’m sorry that you’re running into this issue!
As a first step, can you run through the steps outlined here to check for any conflicts that might be occurring with your theme or another plugin? You’ll want to drop down to a completely default environment (all other plugins besides The Events Calendar, Event Tickets, and Event Tickets Plus disabled and the Twentyseventeen theme enabled) and see if this is still happening. You can create a copy of this event and ticket and do a test order to see if you are seeing the same thing. Please make sure to have WP_DEBUG enabled while testing and copy/paste any errors that you see into your reply. If you don’t have a testing site already, the free Duplicator or WP Staging plugins can help you get one set up.
Let me know what you find! Can you also send a screenshot of the ticket settings for this event (with all sections expanded) so that I can do some testing on my end? Please note that if you reply via email, attachments will not come through; you’ll need to login and upload the image directly to the thread.
Thanks,
Jennifer