Funny problem updating the database

I have the following sub to change every cell in one column on a datagridview. I can see they all changed correctly. But then when I go update to to the database, for some funny reason, always the first cell on the column, has the old value updated into the database. Anybody know why?

VB Code:

Private sub changeDetailColumnValue()
    Dim i as Integer
    For i = 0 to (ds.Tables("myTable").Rows.Count - 1)
        DetaGridView.Rows(i).Cells(3).Value = "Test Completed"
    Next
End Sub

I noticed that since the row indicator is on the first row. After I changed the cell values, if I click on any other row on the datagridview, then I don't have this problem.

Is it possible to move the row indicator down to the empty row after the last row?