Using conflicting or contradictory tags in your web site. You should constantly use consistent and coherent tags on the site. As an example, you should not use and on a similar site. This may confuse engines like google and could bring about them to ignore or penalize your website page. https://prestashophreflang49922.wikibriefing.com/2756089/an_unbiased_view_of_automatic_hreflang_tags_canonical_tags_all_pages_seo