Hello, @zsimaiof,
Please update your theme to the latest version, along with all plugins. This should resolve your issue. You can review the theme changelog here: https://themeforest.net/item/porto-responsive-wordpress-ecommerce-theme/9207399#item-description__change_logs
For instructions on how to update the theme, please refer to this guide: https://www.portotheme.com/wordpress/porto/documentation/update-theme/
Best Regards,
PThemes Team.