Why does a DataGridView row disappear when I first make empty in a particular column

Dear Sir

Why does a DataGridView row disappear when I first make empty in a particular column.

 I tried according to your recommendation but there is an error 'Additional information: Operation is not valid because it results in a reentrant call to the SetCurrentCellAddressCore function.'

Protected Sub updateDataSource()
    BindingSource1 = New BindingSource With {.DataSource = New BindingList(Of Products)}
    'error below line code ` Operation is not valid because it results in a reentrant call to the SetCurrentCellAddressCore function`
    DataGridView1.DataSource = BindingSource1
    DataGridView1.AutoGenerateColumns = False
    DataGridView1.AllowUserToAddRows = False
    DataGridView1.Columns("PRICE").DefaultCellStyle.Format = "c2"
    DataGridView1.Columns("PRICE").DefaultCellStyle.FormatProvider = CultureInfo.GetCultureInfo("en-US")
    DataGridView1.Columns("TOTAL").DefaultCellStyle.Format = "c2"
    DataGridView1.Columns("TOTAL").DefaultCellStyle.FormatProvider = CultureInfo.GetCultureInfo("en-US")
    BindingSource1.AddNew()
End Sub

Private Sub DataGridView1_DataError(sender As Object, e As DataGridViewDataErrorEventArgs) Handles DataGridView1.DataError
    If e.Context = DataGridViewDataErrorContexts.Commit Then
        MessageBox.Show(String.Format("value is required.", e.ColumnIndex))
        UpdateDataSource()
    End If
End Sub