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Thanks Dirk. Very insightful tip about not using campaign tracking to check internal links. There was an old blog post that had anchor text with campaign tracking that was causing many SEO issues. As for the latter part, it is unknown why a string of gibberish can be placed after /blog/ and also for our locations page. Our team's web developer is looking further into this issue. If anyone has any more advice on the matter it would be greatly appreciated.

Hello all,

For the last few months, Moz has been showing us that our site has roughly 2,000 duplicate content errors. Pages that were actually duplicate content, I took care of accordingly using best practice (301 redirects, canonicalization,etc.). Still remaining after these fixes were errors showing for pages that we have never created.

Our homepage is www.primepay.com. An example of pages that are being shown as duplicate content is http://primepay.com/blog/%5BLink%20to%20-%20http:/www.primepay.com/en/payrollservices/payroll/payroll/payroll/online-payroll with a referring page of http://primepay.com/blog/%5BLink%20to%20-%20http:/www.primepay.com/en/payrollservices/payroll/payroll/online-payroll. Some of these are even now showing up as 403 and 404 errors.

The only real page on our site within that URL strand is primepay.com/payroll or primepay.com/payroll/online-payroll. Therefore, I am not sure where Moz is getting these pages from.

Another issue we are having in relation to duplicate content is that moz is showing old campaign url’s tacked on to our blog page i.e. http://primepay.com/blog?title=&page=2&utm_source=blog&utm_medium=blogCTA&utm_campaign=IRSblogpost&qt-blog_tabs=1.

As of this morning, our duplicate content went from 2,000 to 18,000. I exported all of our crawl diagnostics data and looked to see what the referring pages were, and even they are not pages that we have created. When you click on these links, they take you to a random point in time from the homepage of our blog; some dating back to 2010.

I checked our crawl stats in both Google and Bing’s Webmaster tool, and there are no duplicate content or 400 level errors being reporting from their crawl. My team is truly at a loss with trying to resolve this issue and any help with this matter would be greatly appreciated.