Slider Images Issues

Hello!
I’m using the Sydney theme. I created images to the exact specifications for the homepage sliders. They look great in the preview, but when I look at the final page, they are cut off at the bottom. I have tried reloading new images, using different images, but I’m at a loss. HELP! I don’t know much about code, so I don’t know if there is something I have to change there or what. Ugh.

Thanks,

Juliana