Incorrect canonical implementation: Make sure that the canonical URL is suitable and isn't going to conflict with hreflang directives. Your x-default should not stage in your English website page. Alternatively it really should place into a website page for end users to pick their language or get redirected to the https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/30904-automatyczne-tagi-hreflang-i-tagi-kanoniczne-seo.html