Hi freddublin
I apologize for any inconvenience caused.
This bug happened 6 months ago so it has to be fixed, however ,there can be something that is causing it at your site.
Please, make sure that you have the last update of ATUM add-ons, and if you have and the problem persists, I have to ask you to open a private ticket and attaching the error log.
This is the link to open the private ticket: https://stockmanagementlabs.ticksy.com/tickets/
And follow this documentation to know how to activate the error log: https://wordpress.org/support/article/debugging-in-wordpress/
Remember to make a reference to this post if you open the private ticket.
Best Regards,
Andrea.