WordPress will automatically create a Mine view for post types that have multiple authors. With a recent change to WooCommerce core, the customers are now the author of the orders, so Mine is showing and causing confusion. This filter will remove Mine from orders.
Add code to your child theme’s
functions.php file or via a plugin that allows custom functions to be added, such as the Code snippets plugin. Avoid adding custom code directly to your parent theme’s
functions.php file as this will be wiped entirely when you update the theme.
You could also change the “Completed” status to be another order status, like “Processing”