Update column list from the task form

Why in the task form, when I write in specific multi line textbox field in the form and save this form, and this field is connected with one multi line text column in the list sharepoint, the text that I wrote in the form, not shown or added in the list in sharepoint???

The multi line text column in the sharepoint is single text format, not is rich text. The control in task form is added from this list column.

But does not update this column in ths list.

Federico MS.