The issue could be attributable to possibly spammy articles or spammy markup usage. Even so, The problem may not be a syntax situation, and so the Rich Effects Check is not going to manage to establish these problems. Troubleshoot lacking rich success / fall in full rich success. Schema.org is https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html