Try to do the following steps:
1. Be sure that you have deactivated all the external plugins while checking and don’t have child theme.
2. Update the theme and all the included plugins to the latest versions.
3. Disable swatches attribute to be displayed on the shop page in Theme Settings -> Shop -> Attribute swatches.
4. Go to Appearance -> Customize -> WooCommerce -> Product images, decrease images size for both single and catalog page and save to regenerate all thumbnails.
5. Keep plugins deactivated and send us the admin access so we can check it as well.