My get request is executing twice for "/", any ideas why?

public static void main(String[] args) {
    staticFileLocation("/public");
    CourseIdeaDAO dao = new SimpleCourseIdeaDAO();

    before((req, res) -> {
        if(req.cookie("username") != null){
            req.attribute("username", req.cookie("username"));
        }
    });

    before("/ideas", (req, res) -> {
       if(req.attribute("username") == null) {
           setFlashMessage(req, "Oops, you're not signed in! Please sign in to see this page.");
           res.redirect("/");
           halt();
       }
    });

    get("/", (req, res) -> {
        Map<String, String> model = new HashMap<>();
        model.put("username", req.cookie("username"));
        model.put("flashMessage", getFlashMessage(req));
        System.out.println("flash message added to model");
        return new ModelAndView(model, "index.hbs");
    }, new HandlebarsTemplateEngine());

    post("/sign-in", (req, res) -> {
        Map<String, String> model = new HashMap<>();
        String username = req.queryParams("username");
        res.cookie("username", username);
        model.put("username", username);
        res.redirect("/");
        return null;
    });

    get("/ideas", (req, res) -> {
        Map<String, Object> model = new HashMap<>();
        model.put("ideas", dao.findAll());
        model.put("flashMessage", captureFlashMessage(req));
        return new ModelAndView(model, "ideas.hbs");
    }, new HandlebarsTemplateEngine());

    post("/ideas", (req, res) -> {
        String title = req.queryParams("title");
        CourseIdea idea = new CourseIdea(title, req.attribute("username"));
        dao.add(idea);
        res.redirect("/ideas");
        return null;
    });

    post("/ideas/:slug/vote", (req, res) -> {
        CourseIdea idea = dao.findBySlug(req.params("slug"));
        boolean added = idea.addVoter(req.attribute("username"));
        if(added) {
            setFlashMessage(req, "Thanks for voting! Your vote has been added to " + idea.getTitle() + ".");
        }else{
            setFlashMessage(req, "Not so fast, my friend! You already voted for " + idea.getTitle() + ".");
        }
        res.redirect("/ideas");
        return null;
    });

    get("/ideas/:slug", (req, res) -> {
        Map<String, Object> model = new HashMap<>();
        model.put("idea", dao.findBySlug(req.params("slug")));
        return new ModelAndView(model, "idea.hbs");
    }, new HandlebarsTemplateEngine());

    exception(NotFoundException.class, (exc, req, res) -> {
        res.status(404);
        HandlebarsTemplateEngine engine = new HandlebarsTemplateEngine();
        String html = engine.render(new ModelAndView(null, "not-found.hbs"));
        res.body(html);
    });
}

private static void setFlashMessage(Request req, String message) {
    req.session().attribute(FLASH_MESSAGE_KEY, message);
}

private static String getFlashMessage(Request req){
    if(req.session(false) == null)
        return null;

    if(!req.session().attributes().contains(FLASH_MESSAGE_KEY))
        return null;

    System.out.println("get executed");
    return (String) req.session().attribute(FLASH_MESSAGE_KEY);
}

private static String captureFlashMessage(Request req){
    String message = getFlashMessage(req);

    if(message != null)
        req.session().removeAttribute(FLASH_MESSAGE_KEY);

    System.out.println("capture executed");
    return message;
}