Question string is removed only when essential, pagination is retained and managed (an present "prev/up coming" mechanism is required, more recent PS already does it) The default homepage title is the identify of The shop, and as a consequence the index' title industry is empty. If you put content in https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html