Leaflet Draw, Only marker showing, Lines and Polygons not visibile - leaflet

Question

I'm trying to add the Leaflet Draw library / control.
I can add a marker, and it persists (and stays visible). But when I add a line or polygon they aren't visible (persisted though if I inspect the .layers, also check the screenshot. The element seems to be there, but it just isn't visible).
Any guidance would be highly appreciated!
Edit: I'm using the following code to initialize the map:
var elem = angular.element('#datasetLeafletMap'); //using Angular
console.log('initting map', elem[0]);
var osmUrl = 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
osmAttrib = '© OpenStreetMap contributors',
osm = L.tileLayer(osmUrl, { maxZoom: 18, attribution: osmAttrib });
var map = new L.Map(elem[0], { layers: [osm], center: new L.LatLng(52.105289405897, 5.2629891004852425), zoom: 13 });
console.log('map ready');
var drawnItems = new L.FeatureGroup();
var coords = [new L.latLng(51.2, 4.5), new L.latLng(51.2, 4.6), new L.latLng(51.2, 4.9)];
var poly = new L.Polyline(coords, {
color: 'blue',
opacity: 1,
weight: 5
});
drawnItems.addLayer(poly);
map.addLayer(drawnItems);
var drawControl = new L.Control.Draw({
draw: {
position: 'right',
polygon: {
title: 'Polygon',
allowIntersection: false,
drawError: {
color: '#b00b00',
timeout: 1000
},
shapeOptions: {
color: '#bada55'
},
showArea: true
},
polyline: {
metric: false
},
circle: {
shapeOptions: {
color: '#662d91'
}
}
},
edit: {
featureGroup: drawnItems
}
});
map.addControl(drawControl);
map.on('draw:created', function (e) {
var type = e.layerType,
layer = e.layer;
if (type === 'marker') {
layer.bindPopup('A popup!');
}
drawnItems.addLayer(layer);
console.log('adding layer', layer, drawnItems);
});