The cited link explains this issue, please: https://xlsform.org/en/#choice-names.
It was very often discussed in the forum. You can (always) give the search function a try please, e.g. Search results for 'allow_choices_duplicates' - KoboToolbox Community Forum .
Let us avoid, please, to post the same issue twice, see your first post 2h before: Hello I have some issues as attached and how can I solve the problem . (You can add new information in the same thread, if needed)
