Hi @robert2811 ,
I apologize for any inconvenience caused, but maybe it has nothing to do with ATUM but with Woocommerce. Please, try to deactivate ATUM plugins, and tell us if the problem persists.
In addition, in this woocommerce screen, variable products are shown as out of stock if the general stock of the product is 0, even the variations have stock. Just take it into account as it is not a bug.
Best Regards,
Andrea