Gallery Slider

I am having trouble displaying a gallery. This is the shortcode I am using:
[device type=”macbook”][gallery size="large" ids="827,812"][/device]

Here is what it looks like on the site: http://zeemdevelopment.com/wp-content/uploads/2017/03/gallery.jpg

I only see one picture which doesn’t fill the macbook, and the rest are just gray screens. The picture sizes are 1440×900 and the default size for large in wordpress is set to max width:1920 and max height: 1920.