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🛠️ Fix Duplicate H1 Tags Blocking OTTO SEO

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Camilo Aponte

Camilo Aponte

Last updated on Sep 30, 2026

🔍 Overview

Some customers have noticed that their published Website Studio site contains a duplicate H1 tag inside the index.html file. This duplicate H1 is not visible or editable through the Website Studio interface, but it can trigger an SEO audit failure and prevent OTTO SEO from fully optimizing the page. This article explains what causes the issue, how to confirm it, and what steps to take.

⚙️ What Causes the Duplicate H1?

A known bug in Website Studio can cause certain published sites to generate a duplicate H1 tag inside the compiled index.html file. This happens at the code-generation level, meaning the duplicate does not appear in the visual editor and cannot be deleted manually by the customer.

📊 How This Affects OTTO SEO

OTTO SEO scans your live page and flags any page that contains more than one H1 tag as an error. When a duplicate H1 exists in the compiled HTML, OTTO cannot clear this audit item automatically because the second H1 is not part of your editable content. As a result:

  • Your Search Atlas SEO audit will show a duplicate H1 warning on the affected page.
  • OTTO SEO may be unable to complete its full optimization pass for that URL.
  • The issue persists even after editing or saving changes in Website Studio.

✅ How to Confirm the Issue

  1. Open your live site URL in a browser, right-click the page, and select View Page Source.
  2. Use Ctrl+F (or Cmd+F on Mac) and search for <h1. If two or more results appear in the source code, the duplicate is confirmed.
  3. You can also check your OTTO SEO audit results for your Website Studio domain and look for any H1-related error on the homepage or any published page.

🚀 Next Steps

Because the duplicate H1 lives inside the compiled index.html file and not in the visual editor, the fix must be applied at the backend level. This is a known bug that requires intervention from our support team. When reaching out, please have the following ready:

  • Your Website Studio domain or project name
  • The specific page URL where the duplicate H1 appears
  • Confirmation that you have verified the duplicate in the page source (the number of <h1 results found)

If you need further assistance, open the chat widget in the bottom-right corner of the platform and type human teammate to be connected with a member of our team.