Leaflet broken tiles with ionic

Ionic displays these broken tiles when loading a map.

I've tried both loading bower and straight from Leaflet but nothing has changed. I'm using a special Leaflet Directive but event with pure leaflet code, I still get these broken tiles.

including the libraries in index.html

<!-- Extra libraries -->
        <script src="js/lib/leaflet/leaflet.css"></script>
        <script src="js/lib/leaflet/leaflet.js"></script>
        <script src="js/lib/leaflet/angular-leaflet-directive.min.js"></script>

map.html

<ion-view view-title="Map">
    <ion-content scroll="false">
        <leaflet id="map" center="map.center" defaults="map.defaults"></leaflet>
    </ion-content>
</ion-view>

controllers.js

var app = angular.module('controllers', ['leaflet-directive']);

app.controller('MapController', function($scope) {
    $scope.map = {
        defaults: {
            tileLayer: 'http://{s}.tile.osm.org/{z}/{x}/{y}.png',
            maxZoom: 18,
            zoomControlPosition: 'bottomleft'
        },
        center: {
            lat: 51.505,
            lng: -0.09,
            zoom: 4
        }
    };
});