You specify the first URL as the search engine may have issues identifying which one particular really should be the principal URL.  The following tutorial will tell you about how you can help Canonical URLs in Prestashop 1.five. It may even allow you to add the default "x-default" tag https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html