Yes, and it's worth knowing. Some apps that modify orders in Shopify can leave the order with a total of 0, and we read that total as $0 revenue.
What to check
If you see orders with zero revenue for no apparent reason, check whether an app is editing those orders after they're created.
We can delete specific orders as an exception, but if the app updates them again, they come back to us. The real fix is for the app to stop rewriting those orders.