When I went to the link you provided and right clicked on the thumnails and copied their url's I put them in a text file to compare them. I can see that the picture of the little girl was going to images/1/girl3_62c.jpg and the photographer was going to images/1/photographer_62c.jpg.
When you tested this were those the only images in the directory? You should try a test like this by making a new directory with nothing in it, then do the upload with the resize and check the full contents to see what images were added. If you are getting the resized version of the uploaded image the original should also be there since they are all working with the same image.