Lightbox Loading Behind Default Preview

when i have “Enable Lightbox” checked in the settings, it loads behind the default preview box. After I close the default box, the Lightbox is still there and displays how it should of to start with. I have a screenshot if you need.

Here’s a link to a page. Just click on the large image. You’ll see both load. Click the top one to close it and Lightbox will be displaying properly.
http://www.shakeyhands.com/client/kananitat/product/goldfish