Hello, thank you for getting in touch with us.
It seems like there is some error in your site caused due to plugin/theme conflict. Can you please check from your side .
Disable all the plugins except WooCommerce and WC Marketplace for testing purposes and check again. If the issue still exists, please switch to some default theme like Twenty Sixteen and check again.
Let us know the result so we can help you out further.
Also, it will help us if you can share the page link.