Same issue here. A costumer orders 10 blue bags for €100. After the order, I remove two blue bags and add two red bags. Exactly the same price. The order amount stys the same, €100.
Now the nonsense: the orders export csv shows €120 for this order. There is no way to see the removed items. But why are the added items there then? In my returns report, the two blue bags I removed are also not there. Sorry but this doesn’t make any sense. Please shopify, fix this! Just don’t list the removed items in the orders export csv!!!