Please paste images inline (with your post text). Not all Nation users can see attachments, which makes them very confusing.
Please attach -- in this case you do have to attach, since it's not an image -- an exported CSV (don't use "CSV (Excel)" but just "CSV") including this column and illustrating the lost data.
Hi, it's actually an image : a screenshot of the Properties of the fields used in the survey. But actually I think the issue is because of some punctuation inserted in the answer : if you can see the image below, you can see that there is this ";" before the answer. When this occurs, I don't see the answer in the Excel file exported.... maybe a bug ?
I was asking you to attach the CSV that you say is unreadable. Use "CSV", not "CSV (Excel)".