Duplicate language code in hreflang set: what it is, why it matters, and how to fix it

The hreflang annotations contain duplicate entries for the same language-region code, pointing to different URLs. Google cannot determine which URL is the correct one for that language.

Duplicate language codes create conflicting signals that may cause Google to ignore the entire hreflang set or pick an unintended URL for that language. This results in unpredictable behavior in international search results and potential traffic loss in affected regions.

Remove duplicate hreflang entries so that each language-region code appears only once. If you have multiple pages for the same language but different content, they should have different URLs and separate hreflang sets.

This is a medium-severity issue: individually modest, but it compounds — dozens of medium issues across hundreds of pages add up to a real quality deficit in how search engines assess the site. It belongs to the indexability family of checks.

Run a free Dr Urls audit: it crawls your site, detects duplicate language code in hreflang set on every affected page, shows example URLs, and generates a ready-to-use fix task. Re-scan after fixing to verify the issue is gone.