Hello Juan,
I ran the tests you suggested and came to a very interesting conclusion.
After deactivating all the plugins and leaving only YITH WooCommerce Wishlist, I was activating plugin by plugin and testing to see if there was any plugin conflicting and I noticed that there is.
This all happens when the “Elementor” plugin is switched on. Could it be because the text box where you have the shortcode for YITH Woocommerce is edited in Elementor?
I look forward to some feedback.
Best regards.