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This might seem a bit of an odd one, but we seem to be going around in circles on this when using the on page optimizer tool. We have an ecommerce site (magento) which by default is putting a canonical link in the header on every product page. For example; www.example.com/product1.html has the But when we run the on page optimiser tool, we're losing points on the critical section for not having canonical set correctly. If we remove the tag, we get the tick and the a grade, but then further down the report we lose a tick for not using canonical links. What are we missing here?