MYSQL行数据不会在HTML表单字段中回显/显示

Part of my assignment to create a form to update specific row data via HTML form. I have successfully retrieved the row data from the mysql database but when I try to display the specific row data (StudentNumber, FirstName, LastName etc.) within the html form's fields, it just shows empty fields. What could I have possibly missed out?Part of my assignment to create a form to updat