Hi HOWM
That's weird. Please, can you make sure that you have the last update of ATUM add-ons? If you have and the problem persists, I have to ask you to 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/tickets/
And remember to make a reference to this post.
Best Regards,
Andrea.