changing order status with "apply" button doesn't work

I changed a new order to “completed” in the top right dropdown when viewing the order, and then clicked the “apply” button to the right… and the email went to the customer. Came back to the orders and it still appears as “processing”… tried changing the status again and this time I clicked the “save order” button. Email went to the customer AGAIN, and this time the actual order status changed to completed.

It seems like the “apply” button doesn’t actually save the new order status.

Is this correct? if so, it’s definitely odd behavior and maybe a misnamed button.. could someone explain what’s going on?

thanks!

http://wordpress.org/plugins/woocommerce/