Different Canonical URL

A canonical URL is an HTML tag that tells Google which is the main version of a page. When that tag points to a different address from the one you're visiting, this error occurs. Basically, the page is telling search engines that there's a more important version somewhere else. And Google, which usually listens, may decide to ignore the current page and give all its attention to the one the canonical points to. The problem is that this isn't always intentional. In many cases it happens due to poorly closed migrations, templates that auto-generate canonicals, or configurations nobody reviewed since the page was published. Though it also happens on purpose, when you want multiple URLs to point to a single version as the primary one. If the canonical is pointing to the wrong place, that page's content can fall off Google's radar even if it's perfectly written and structured.