Please update your Theme and Plugins to the very latest version 6.10.0 and check back again. I hope this will solve your issue.
Please check the changelog here: https://themeforest.net/item/porto-responsive-wordpress-ecommerce-theme/9207399#item-description__change_logs
Please read the migration to 6.10.0 guide here: https://www.portotheme.com/wordpress/porto/documentation/points-to-be-noted-when-migrating-to-porto-6
How to update the theme: https://www.portotheme.com/wordpress/porto/documentation/update-theme/