After choosing to download a CSV file, the user gets into the file the JSON format, instead of a CSV format.
That happened while trying to use a grid field.
1. Add a grid field;
2. Publish form;
3. Submit responses;
4. Open "View Entries" in the form manager screen;
5. Select the entries to be exported;
6. Click on the kebab menu on the top right of the screen;
7. Choose CSV as file format to be exported;
8. Download and open file;
9. Format appears like a JSON format (Café da manhã.csv).