Hi Anne!
Thanks for reaching out to us! Let me help you with that issue.
The latest release of our plugins includes a new functionality to manually reorder the tickets for an event, by drag & dropping the tickets in the ticket editor while on the edit event screen.
It doesn’t affect any functionality of your tickets, just the order in which they are presented in the frontend, so you should be safe in doing so.
That said, we always suggest to setup a dev/staging site so you can test things out and make all plugins, theme and WordPress core updates. This is a safe way to test things out without disrupting the live site.
We also encourage to make a full backup of your site, both database and files so in case something goes wrong you can always restore your site.
I hope that helps. Let me know if you have any follow up questions.
Best,
Victor