Incorrect canonical implementation: Ensure that the canonical URL is right and isn't going to conflict with hreflang directives. As described over, the hreflang and canonical tags have slight differences inside their use and software. They can, having said that, be Utilized in conjunction if you wish to Blend their apps. https://addons.prestashop.com/fr/seo-referencement-naturel/30904-balises-hreflang-automatiques-et-balises-canoniques-seo.html