Nacho's questions

I want to replace my project's confirms with SweetAlert2 dialogs but I'm having a problem handling cancel. I want that when clicking on a checkbox it shows a confirmation dialog and that if the user clicks on the cancel button the checkbox does not remain selected.

My code:

$(element).click(function (e) {
                            swal({
                                title: 'Seleccionado',
                                text: "¿Está seguro que desea seleccionarlo?",
                                type: 'warning',
                                showCancelButton: true,
                                confirmButtonColor: '#3085d6',
                                cancelButtonColor: '#d33',
                                confirmButtonText: 'Si',
                                cancelButtonText: 'No'
                            }).then((result) => {
                                if (result.value) {
                                    guardar(true);
                                } else {
                                    return false;
                                }
                           });
                        });

For some reason when you click "No" it executes what you put in the else but the checkbox remains selected.

Any idea how to fix it?