[Решено] Custom field in Woo Product category will not keep translation, after product translation is called

Background of the issue:
I created two additional Text fields in Woo Product Category. When I translate the categories I have to edit these fields twice until the translation keeps the content of the fields. Now the fields are shown in frontend. But after I changed the translation of one product out of this category the content is deleted again. I already placed the two values as custom field in XML Configuration. The site I need help with is скрытая ссылка.

Fields are (in Screencast "Kurzbeschreibung" and "Zusatz-Informationen Shortcode"

Symptoms:
Custom field in Woo Product category will not keep translation after product translation is called.

Questions:
Why do I have to edit the custom fields twice for the translation to keep?
Why is the content of the custom fields lost after changing the translation of a product in the category?