Howdy Anna,
Welcome to our support forums and thanks for reaching out to us. I’ll try to help you here…
I’m not sure what happened with that order you mention. If a user cancels an order the status should be cancelled and not deleted. Are you the only one managing the site? Maybe it was a test order that was deleted after the test was confirmed?
Just to check the correct that tickets sale works as expected, you can place a test order and see if it shows up in the admin as expected.
Please give it a try and let me know,
Best,
Nico