A canonical tag can sit in your source code and still not count. If anything breaks the page’s head before Google reaches it, the tag ends up in the body, and Google ignores it.
Insights
Technical
Written when something is worth writing down — a mechanism most checks miss, or a method you can run on your own site.
A crawler sorts findings by how often they occur, because count is all it can measure. The issue costing you customers sits eightieth, mentioned once.
Start with the diagnosis.
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