Chartjs bar chart not showing full axes

bar.js

function colorconvert(color, transparency) {
	var r = parseInt(color.substring(0,2),16);
	var g = parseInt(color.substring(2,4),16);
	var b = parseInt(color.substring(4,6),16);
	var a = parseFloat(transparency);
	var value = 'rgba(' + r + ', ' + g + ', ' + b + ', ' + a + ')';
  return(value);
}

$(document).ready(function(){
	$.ajax({
		url: "http://path/to/data.php",
		method: "GET",
		success: function(data) {
			console.log(data);
			var haus = [];
			var punkte = [];
			var backgroundcolor = [];
			var bordercolor = [];
			var hoverbackgroundcolor = [];
			var hoverbordercolor = [];
			var backgroundtransparency = [];
			var bordertransparency = [];
			var hoverbackgroundtransparency = [];
			var hoverbordertransparency = [];

			for(var i in data) {
				haus.push(data[i].haus);
				punkte.push(data[i].punkte);
				
				backgroundcolor.push(colorconvert(data[i].backgroundcolor, data[i].backgroundtransparency));
				bordercolor.push(colorconvert(data[i].bordercolor, data[i].bordertransparency));
				hoverbackgroundcolor.push(colorconvert(data[i].hoverbackgroundcolor, data[i].hoverbackgroundtransparency));
				hoverbordercolor.push(colorconvert(data[i].hoverbordercolor, data[i].hoverbordertransparency));
			}

			var chartdata = {
				labels: haus,
				datasets : [
					{
						label: 'Hauspunkte',
						backgroundColor: backgroundcolor,
						borderColor: bordercolor,
						hoverBackgroundColor: hoverbackgroundcolor,
						hoverBorderColor: hoverbordercolor,
						data: punkte
					}
				]
			};

			var ctx = $("#mycanvas");

			Chart.defaults.global.scaleBeginAtZero = true;

			var barGraph = new Chart(ctx, {
				type: 'bar',
				data: chartdata,
				options: {
					scaleBeginAtZero: true
				}
			});
		},
		error: function(data) {
			console.log(data);
		}
	});
});