Incorrect canonical implementation: Make sure that the canonical URL is proper and isn't going to conflict with hreflang directives. Canonicalization, On the flip side, discounts with copy or similar material across numerous URLs. A canonical tag (rel=canonical) placed within the HTML header of the webpage tells search engines like google https://addons.prestashop.com/ru/seo-natural-search-engine-optimization/30904--hreflang-seo.html