Text column uses as Payee, but for your specific file it could be a different way like this column has to be Payee, this column has to be Memo or your CSV file doesn't have Payee and Memo, it has just a long description, so you can use this description for both Memo and Payee. It sees the Text column and uses, as a Memo column, it is another column.
Or let's say some columns have some Payee and Memo columns and they could be switched, like the converter decides, especially if the columns are not properly marked and there is no first line, as column names. But it could be not the column you want to use, so you can review Mapping if needed or you can reassign columns. If your CSV file has multiple Date columns, it may choose the first column or the column it decides most appropriate. What do you see at the Transaction tab? You see how the converter understood your CSV file.