Incorrect canonical implementation: Ensure that the canonical URL is appropriate and would not conflict with hreflang directives. As described higher than, the hreflang and canonical tags have slight variations in their use and application. They're able to, however, be used in conjunction if you want to Mix their apps. Pro-Suggestion: https://addons.prestashop.com/de/seo-suchmaschinenranking-optimization/30904-automatische-hreflang-tags-und-kanonische-tags-seo.html