Hi Julie!
Thanks for getting in touch with us. I’m really sorry you are experiencing this issue.
Unfortunately, this is a known conflict with ACF and our plugins, related to the select2 JavaScript library. The good news is we have already made a fix for it and we are planning on releasing it in our next maintenance release cycle this week.
I have linked this thread to the report so we’ll let you know as soon as the fix is released.
The only workaround we’ve found so far is downgrading The Events Calendar to version 4.6.3 and Event Tickets to version 4.5.7. To learn how you can downgrade, please refer to the following article > https://theeventscalendar.com/knowledgebase/downgrading-plugin-past-version/.
Please let me know if you have any follow up questions.
My apologies for the inconvenience and we appreciate your patience while we work on this.
Best,
Victor