Incorrect canonical implementation: Be sure that the canonical URL is proper and doesn't conflict with hreflang directives. As pointed out above, the hreflang and canonical tags have slight differences in their use and software. They're able to, even so, be used in conjunction if you wish to combine their apps. https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/30904-automatische-hreflang-tags-en-canonieke-tags-seo.html