Images doesn't always load on page load.. need to refresh to load images

I'm using the roundabout plugin with Joomla version 3.3.0 (latest)

I notice sometimes when loading the page with the roundabout on it, the images may or may not load, leaving a blank area. The only way to get the images to appear is to try to refresh the page.

Attached are some images showing this.

1. All items have loaded
2. Just the handgun image has been loaded
3. The assault rifle image hasn't been loaded
4. No items have been loaded

These screenshots were taken pretty much after a single refresh of the page.

Is there any way I can make sure the page is loaded after the images are loaded and the script is loaded? Is there anything to check?