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This could be due to several reasons, including:

1. The language/region settings on the device may not be set correctly.

2. The app may not be configured to support localization and internationalization.

3. The UIDatePicker may not be using the appropriate date format based on the user's language and region.

4. There may be a bug or issue with the UIDatePicker implementation in the app.

To resolve this issue, the developer should ensure that their app is properly configured for localization and internationalization and that the date picker is using the correct date format based on the user's language and region. They may also consider testing the app on different devices with different language and region settings to ensure that it is working as expected.