In all CMS Website, it is hard to prevent duplicate content issues in term of direct url, categories, tags, authod archives etc. They have not made their CMS friendly to these.
Are your website’s pages are indexing on search engines with their categories, tags, and author archives? Your site may be penalized by Google panda due to duplicate content issues.
You can make them noindex for search engines, so that there would not be any confusion for search engines. Search engines can pick original URLs without any confusion.
Hope these helps!
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