The declared language does not match the language the page is actually written in. This is the failure that sends a Spanish reader to an English page and counts as a correct result.
The finding reads:
warning hreflang-lang-mismatch the self-reference is declared as “…” while the page declares lang=“…”Bring the declared language in line with the language the text is written in. While they disagree, the engine shows the page to the wrong readers — and counts that as a correct result.
Collapsed when it fires template-wide. If it appears on 90% or more of the pages — or of one language version — of a site with at least 20 pages, it is a property of the template and is reported once, with the count, instead of once per page.
pipx install indexgap
cd your-project
indexgap init
indexgap checkThen indexgap brief turns
every finding on this page into a work order in indexgap-briefs/,
with the thresholds the result has to satisfy and the command to check it.