Python - remove_widget does not remove everything you need

Good evening, everyone. I have a screen where you have four fields to add products: "description", "unit value", "quantity" and "total value"

To add more products, have a "+" button and to remove the last line, a "-" button as in the image:

Toadd,it'sgood.Ialreadydidthefunctioncode.Theproblemisbeingremoved.Forexample,Iaddfiveinstancesofwidgets,butwhenIremoveit,Ipressthe"-" button, it removes the last one, but if I press it again, it does not remove any more lines.

Does anyone have any idea what it can be? I do not know if the brain gets addicted, but I can not walk it anymore, ahah!

For information purposes, follow the codes:

class TelaEmissor(RelativeLayout):
    def adicionarProduto(self):
        self.item = MDTextField(size_hint_x = 0.1, write_tab=False)
        self.quantidade = MDTextField(size_hint_x = 0.045, pos_hint= 0.25, write_tab=False, text='0', id="quantidade"+str(contador))
        self.valorUn = MDTextField(size_hint_x = 0.05, pos_hint = 0.25, write_tab= False, text='0', id="valorUn"+str(contador))
        self.valorTotal = MDTextField(size_hint_x= 0.05, pos_hint = 0.25, id="valortotal"+ str(contador), write_tab=False, text='0')
        self.cFOP = AutoInput(size_hint_x=0.03, pos_hint=0.25, write_tab=False, id="cFOP"+str(contador))

        self.ids.boxItens.add_widget(self.item)
        self.ids.boxItens.add_widget(self.quantidade)
        self.ids.boxItens.add_widget(self.valorUn)
        self.ids.boxItens.add_widget(self.valorTotal)
        self.ids.boxItens.add_widget(self.cFOP)           

    def removerProduto(self):
        self.ids.boxItens.remove_widget(self.item)
        self.ids.boxItens.remove_widget(self.quantidade)
        self.ids.boxItens.remove_widget(self.valorUn)
        self.ids.boxItens.remove_widget(self.valorTotal)
        self.ids.boxItens.remove_widget(self.cFOP)

no KV:

          <TelaEmissor>
               id: telaEmissor

               RelativeLayout:
                   size_hint_y: None
                   size: 300,1900
                   pos_hint: {"x": 0.0, "y": 0.2}
                   orientation: "vertical"

               MDRaisedButton:
                   id: btn_add_produto
                   text: "+"
                   pos_hint: {"x": 0.12, "y": 0.701}
                   size_hint: 0.02, 0.015
                   on_release: root.adicionarProduto()

                MDRaisedButton:
                    id: btn_remove_produto
                    text: "-"
                    pos_hint: {"x": 0.15, "y": 0.701}
                    size_hint: 0.02, 0.015
                    on_release: root.removerProduto()

                BoxItens:
                    id: boxItens
                    cols: 5
                    pos_hint: {"x": 0.06, "y": -0.35}
                    size_hint_x: 0.48
                    row_force_default: True
                    row_default_height: 25
                    spacing: 10

If anyone has any ideas, I thank them immensely.