Controllers for buttons in ionic

I've been running into some probelms with my controllers and I want to make sure I'm understanding them right.

I have two buttons that are suppose to link to their controllers

<button class="button button-block button-positive" ng-click="signIn(user)">
  Sign-In
</button>
<button class="button button-block button-positive" ng-click="signUp(user)">
  Sign-Up
</button>

and I have two controllers in my app.js

.controller('SignInCtrl', function($scope, $state) {

    $scope.signIn = function(user) {
        console.log('Sign-In', user);
        $state.go('welcome');
    };
})

.controller('SignUpCtrl', function($scope, $state) {

    $scope.signUp = function(user) {
        console.log('Sign-In', user);
        $state.go('welcome');
    };
})

with the stateProvider being

.config(function($stateProvider, $urlRouterProvider) {

        $stateProvider
            .state('signin', {
                url: '/sign-in',
                templateUrl: 'templates/sign-in.html',
                controller: 'SignInCtrl'
            })
            .state('welcome', {
                url: '/welcome',
                templateUrl: 'templates/welcome.html'
            })

        $urlRouterProvider.otherwise('/sign-in');
    })

Is their a reason the sign in button works and the sign up doesn't?