Slider Image Size

Hi, I have set up slider on my homepage. I preferred a smaller image so I set all images for 602 x 320 (see Old image slide). They all worked well. I then decided to change some images and uploaded them, set them to 602 x 320 in the Media Library. Then I went to each page and changed the featured image to the new one. However it is not working in the slider. The old slides are displaying at 602 x 320 but the new ones are displaying at a larger (original size). Please see two images here DropBox Catch Themes Folder