Incorrect canonical implementation: Ensure that the canonical URL is correct and won't conflict with hreflang directives. If the webpage serves up content in a variety of languages or simply just asks a person to pick a most popular webpage, you can use x-default to show the site isn't exclusively qualified. https://addons.prestashop.com/ru/seo-natural-search-engine-optimization/30904--hreflang-seo.html