You could be creating duplicate content of the same post is accessible as:
domain.com/category/post
domain.com/tag/post
You may end up with posts ranking for keywords used as tags, but it's also possible that overall the site could pull more search traffic without the duplicate content. It depends on how the site is set up. Everything may be fine as is, but see if you can access the same post with different URLs and see if the different URLs are indexed.
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