Comment to Many identical pages with the same title
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Yes, search engines greatly lower a siteβs ranking if it has many identical headings. Often, due to duplicate headers, bots get confused and do not crawl website pages because they consider similar pages to be the same.
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There is also a problem when the same page opens at two URLs. This can be noticed if you disable SEO links: https://unacms.com/d/changing-urls
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I use the paid version of seobility. www.seobility.net