I had set the Resolution value of "Done" as the Default in Jira. In Jira, this just puts "Done" as the value in the Resolution field on our transition screens.
The Service Desk admin (I don't have rights) told me that when they create Service Desk tickets and "Done" is the Default, that the Resolution is set to Done when a ticket is created.
Is that true? Seems like a bad design from Atlassian.
We removed the Default setting on the Resolution field. Now in Jira, you have to actually select Done - the Resolution field doesn't have a value on the transition screen. Not the perfect solution, but it works.