Can’t send test email to anyone but order purchaser

Hi, I’m having a problem with this plugin. Whenever I use this plugin to try to send an email that isn’t meant for an admin (such as Processing Order, Completed Order, Refunded Order, etc), the “Send to Email Address” field is ignored and the email is instead sent to the customer’s email. This plugin works as intended for new/cancelled/failed emails, but not for the rest.

Steps to reproduce:
1) Go to an order in WP
2) In the Send Emails dropdown, choose 1 of the 7 lower options and click Send Email
3) Enter your own email
4) Be disappointed that you didn’t receive any email
5) Get emails from the customer asking why they got that email

Any help on a fix would be great.