Hello,
I understand when the order is making the purchase, the page is spinning.
As a first step, temporarily switch the site theme to Storefront, and disable all plugins except WooCommerce, you can at this point create a test order to check the behavior.
If the issue is not present you can re-enable the original theme, and then the plugins one by one until the cause of the issue is found, make sure to check again after each reactivation. More info is here.
We recommend the Meks Quick Plugin Disabler because it will help to remember what plugins you currently have active, so it’s easy to switch them back on.
Let us know if that worked for you.
@ihereira Thank you so much. All this is very helpful. Thankfully the issue was resolved. It was a email customization that threw things off.