Unsort bundle items on invoice

On my woocommerce I use product bundles.
When creating this bundles I positioned every item on a specific order because its easier to later get the items from the shelves.

The problem is, when printing the invoice for that order the items are sorted alphabetically, which ruins my method.

On the plugin settings there is place when you choose the sorting but the only options are:
– –Select One —
– Name ascending
– Name descending
– SKU ascending
– SKU descending

If I choose “–Select One –” it still sorts by name.

Is there any workaround to un-sort the item list? maybe a code snippet?