This thread is resolved. Here is a description of the problem and solution.
When using Klarna Checkout and WooCommerce Multilingual, the prices in the secondary language are not processed correctly.
This issue has already been escalated to our developers and will be resolved in a future release. There is a quick workaround fix that may help for the time being.
Open the file wp-content/plugins/woocommerce-multilingual/inc/class-wcml-orders.php
Search for the code
add_action('updated_post_meta', array($this,'update_order_currency'), 100,4);
Replace it with
//add_action('updated_post_meta', array($this,'update_order_currency'), 100,4);
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