Some orders marked complete prematurely

I just closed a week long pre-order on my site and I noticed most of the items aren’t appearing on my shipping and fulfillment site. When I checked the orders in Woocommerce I noticed they were marked as “complete”, which implies that they have already been shipped.

This means they aren’t loading on my shipping site where I would normally create the labels and handle fulfillment… so I can’t actually ship them.

How can I mark all of the “completed” orders that have not been completed to be “processing”. Since I haven’t started shipping yet, every single pre-order should be “processing” so I can begin shipping.