Resolved
Resolved in: 4.12.0
Overview of the issue
Sometimes you want to edit the prices on the order page in WooCommerce → Orders. When you set a different price for the item rather than the original unit price, WooCommerce Multilingual plugin tries to convert the item total and returns the item’s default price instead of the manually set one.
Workaround
We’re working on a permanent fix for the issue. A temporary workaround would be using the Update button, not the Save button on the Order edit page.