Hi Porridge
I apologize for any inconvenience caused. In any case, there is no any ATUM funcionality that changes the orders status automatically.
However, if you want us to investigate, please, open a private ticket and provide us with your website credentials in order to take a look.
This is the link to open the private ticket: https://stockmanagementlabs.ticksy.com/
Remember to make a reference to this post.
Best Regards,
Andrea.