Check the canonical URL, spot conflicts, and confirm it points where it should.
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A canonical tag tells search engines which URL is the real one when the same content is reachable several ways. Getting it wrong is one of the more expensive silent mistakes: a canonical pointing at the wrong page can remove that page from results entirely.
A self-referencing canonical on every page is the safe default and costs nothing. It protects against duplicate URLs created by tracking parameters.
You are asking Google to rank the other page instead. Sometimes intended, often a mistake, and it removes the page from results when it is not.
A hint. Google usually honours it but can override it, particularly when the two pages differ substantially.
Yes, and it is legitimate for syndicated content. Be certain, because you are handing the ranking to the other domain.
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