Preventing default event in AngularJS doesn't work correctly

Here is my HTML form:

<form class="form-login" name="loginForm" novalidate ng-submit="login()">
    <fieldset>
        <h2>Login</h2>
        <input type="text" required class="input-block-level" placeholder="Username" ng-model="username" name="username" tabindex="1" xs-input-sync>
        <input type="password" required class="input-block-level" placeholder="Password" ng-model="password" name="password" tabindex="2" xs-input-sync>

    </fieldset>
</form>

and here's the controller method called when submitting the form:

$scope.login = function() {
        $http.post($scope.serviceUrls.getAuthenticationUrl($scope.username), {
            "password": $scope.password
        }).success(function(data, status, headers) {


        }).error(function(data, status) {

        });
        return false;
    }

Everything works fine up to this point. But since the browser only shows the native "Remember Password" dialog only if you have the action="/" attribute set on the form, I've also added it on my form.

After adding the action="/" the form gets submitted when hitting the Enter key or the Login button no matter what I try. I've also tried to add the $event parameter to the html login function call, and then do $event.preventDefault(); but still no go.

The same thing happens on urls like:

<a class="xs-btn edit-btn" ng-click="toggleEditMode($event)"></a>

I've tried: $event.preventDefault();, return false;, adding href="", href="#". But none of the work and I always get redirected to the root of the site. The only one that works is href="javascript:void(0);".

Any idea of what I'm doing wrong? It seems like something is wrong app wide.