Hello there,
Thank you for conacting us.
1. Our latest theme update requires WooCommerce 2.6 version. What version of the plugin do you use? Please update to the latest.
2. Are you able to provide us with your admin access? So we could check what is wrong with this gallery element.
3. All images sizes for your products depend on options set in WooCommerce -> Settings -> Products -> Display. Maybe you need to disable “Crop” options to show your images in right proportion. Don’t forget to regenerate your thumbnails after change.
Regards