On my site, there are two different category bases leading to the exact same page. My developer claims that this is a common — and natural — occurrence when using WordPress, and that there's not a duplicate content issue to worry about. Is this true?
Here's an example of the correct url. and...
Here's an example of the same exact content, but using a different url.
Notice that one is coming from /topics and the other is coming from /authors base. My understanding is that this is bad. Am I wrong?