Good evening Matthew,
Thank you for your answer.
I believe the cause of the issue you are experiencing is the use of The Events Calendar: WooCommerce Tickets version 3.12.1 .
You might not be aware of this, but we have retired that plugin which is now replaced by Events Tickets Plus (which is now a single plugin that encompasses ALL e-commerce platforms: WooCommerce, EDD, Shopp, etc…). This also means that your version of the plugin will not work properly with the latest versions of our plugins.
We even have an awesome tutorial on how to go migrate from WooCommerce tickets to Events Tickets Plus: https://theeventscalendar.com/knowledgebase/moving-to-event-tickets-plus/
I wish I had a better answer for you, but for now it’s the best one I have 🙁
Best regards,
Geoff B.