This question already has an answer here:
look at the URLs below:
1. /essays/technical-essays/180-technologies/247-megapixel 2. /essays/technical-essays/247-megapixel 3. /essays/technical-essays/technologies/247-megapixel 4. /essays/technical-essays/technologies/247-
the right URL is the third one. but the product page shows up with other three URLs. notice that the other three are incorrect and incomplete and an 404 error should be thrown.
don't get this in a wrong way. it's not about canonical more than one direction to a page. it's about inputting wrong (incomplete) URL of an article and having the article page open. weird!!
what is this? why this happens?
google console finds these as different pages and refers to them as "Duplicate title tags"