buttons/icons not showing

I have searched high and low (for 2 days) and can’t find the answer.

So I built my site on the same server it was going to be hosted on and once we had our URL, I created a new folder and migrated everything. It seemed to be up and running but there are a few things that I just can’t figure out for the life of me. If you click on the link, and then click on the product, it brings up a light box.

https://www.wetdeck.com/product/8-nozzle-kit/

In the top right and left (and other places) of the picture, it just shows a square. Some icons on the back end also don’t show. Any help would be great. All the file permissions are correct on the server.