Oh...didn't do that. Hmmm puzzling me as well. I just started using this theme myself so I am not real familiar with it yet.
I looked at the code with Firebug what I see is among the code is: featured_container1 , featured_container3, featured_container5
To me something seems off because I would think it would be 1, 2 3, Which slide show type did you use for the frontpage? ( Note: my CAPS are not SCREAMING....I am just using them so it will stand out :-) This is just a wild guess...
Try going to EDIT THE FRONT PAGE. Choose TEMPLATE BUILDER. See if you have 2 slidshows on the the set up. That might cause double images.
If that fails, I would remove everything from the front page, Delete the images from the Media Library. And give it a fresh try. Sorry to say I have done that alot.