Sorry for the third post, I didn't make the 7 minute limit for the edits. I did discover some more information. So it shows the correct total with tax included in 'Details' and 'Invoice' views but it isn't showing the line for the tax. I did discover that when the order was edited, it seems to have deleted the ot_tax entry in the orders_total table of the database. I can manually add this record back in, but why would editing an order delete an entry for ot_tax in the orders_total table?