ListView not saving items when changing scene or editing

Question

I'm working on basic To Do list. Problem is when I change to another scene and return to the original one where the ListViews are, they are all empty. Also when I edit an item and go to the "Search" scene, the edit didn't save.

Adding stuff seems to be working, so is using the Search bar in a different scene. Just the todoList ListView doesnt seem to be saving items when refreshing.

Is there a problem in my add method? Or is there another issue?

@FXML
private TextField nameField;
@FXML
private ChoiceBox<String> choiceBox;
@FXML
public ListView<String> todoList;

void addItem(MouseEvent event) {
    Item item = new Item();
    String status = choiceBox.getValue();

    if (status.equals("New feature")) {
        item.description = Item.Description.NewFeature;
    } else if (status.equals("Edit feature")) {
        item.description = Item.Description.EditFeature;
    } else {
        item.description = Item.Description.Bug;
    }

    item.name = nameField.getText();
    todoList.getItems().add(item.name + " - " + item.description);
    itemArray.add(item.name + " - " + item.description);
    nameField.clear();

    StringConverter<String> converter = new DefaultStringConverter();
    todoList.setEditable(true);
    todoList.setCellFactory(param -> new TextFieldListCell<>(converter));
    inprogList.setEditable(true);
    inprogList.setCellFactory(param -> new TextFieldListCell<>(converter));
    doneList.setEditable(true);
    doneList.setCellFactory(param -> new TextFieldListCell<>(converter));

Then when I switch scenes to my "Search" page, all the added items show. Problem is when I switch back to my original scene, the listviews are empty again.