I have exactly the same issue. Cutom fields fields are not saved when editing in admin panel. I use 7.0.3 version of the plugin.
Same scenario: there are two custom fields (checkbox and text field). Text field is visible after checking the checkbox. Saving works fine when ordering by customer but not in admin panel. In admin panel checkbox field is visible as text field (it looks exactly the same as on the viceo uploaded by luktol).
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This reply was modified 2 years ago by mdab.