Hello, @Γιώργος Κουκούσης,
Those tags are coming from the third-party plugin: Advanced Product Fields for WooCommerce so in order to remove them you can use the Custom CSS code, please copy and paste the below given CSS code to Porto >> Theme Options >> Skin >> Custom CSS and check back to your site after clearing the browser cache.
.single-product .wapf-product-totals {
display: none !important;
}
Best Regards,
PThemes Team.
