Surveys created in the ArcGIS Survey123 website using non-required drop-down questions display 'Choice #' in the survey data when a null response is submitted and, when designing the survey, a default response is selected prior to filling in the response options.

Workaround

1. In the ArcGIS Survey123 website, click the survey's Design tab.
2. Select the drop-down survey question to edit it.
3. Select any default response option for the drop-down question.
4. Deselect the default response option so there is no default response.
5. Save the changes and republish the survey.

Steps to Reproduce