You have at some point in your code selected the Label from the first row in your grid. You simply need to grab the control from each row before you set the value like this:
For Each row As DataGridViewRow In FormulativeDV.Rows
If Not row.IsNewRow Then
Label lblCtl = (Label)row.FindControl("LabelName")
If Not lblCtl = Nothing Then
lblCtl.Text = (row.Cells(0).Value.ToString)
End If
End If
Next