SCEditor: Dropdown is out of place

When I create the sceditor like in the example, the dropdowns that appear when clicking on the font icon appears in its normal place.

        var textarea = document.getElementById('example');
        sceditor.create(textarea, {
            format: 'bbcode',
            icons: 'monocons',
            autofocus: true,
            style: '../minified/themes/content/default.min.css'
        });

However, once I specify my own toolbar, the dropdown is moved off screen and I have to scroll down for ages to find it.

        var textarea = document.getElementById('example');
        sceditor.create(textarea, {
            format: 'bbcode',
            icons: 'monocons',
            autofocus: true,
            style: '../minified/themes/content/default.min.css',
            toolbarContainer: document.getElementById('toolbar')
        });

Any way to correct the positioning while having a custom toolbar?