Hi MarcoHekler
That's very weird then.
In order to determine if this is being caused by some kind of conflict with any 3rd-party plugin, please follow these steps:
- Disable all your plugins except WooCommerce and ATUM
- Switch your theme to any default one
- If it works correctly afterwards, start enabling them back one by one until you find the source
I would strongly recommend you do so on a staging site, if possible.
Best Regards,
Salva.