Error in Moz duplicate content reports

[rorynatkiel]

Hi - I've run the Moz campaign on a client's site.

Moz is saying that there are duplicate content errors, and when I look at the errors it is showing that they are all to do with the non-www URLs having being duplicated in the www form of the URLs.

However this is not the case - all the non-www URLs are all 301 redirected to the www URLs.

Is this an error in the Moz tool? Has anybody experienced something similar?

[Peterli]

Hi there!

Thanks for reaching out to us!  I am sorry if you might be seeing some discrepancies between our report vs. what you are seeing.  I looked into the campaigns you were mentioning, it looks like the non www urls aren't redirecting with a 301 to the www url like you mentioned, what I am seeing is that they are still sites that register a 200 response.  You can actually see their http response here:

http://www.webconfs.com/http-header-check.php

Hope that helps, at this time we aren't getting any reports of issues with the crawler, but if this is stilling happening after you put in a 301 redirect please let us know at help@moz.com

Best,

Peter
Moz Help Team.

[SSFCU]

Hi Peter,

If pages suspect of duplicate content all register a 200, does that mean they are true duplicates? I am having a situation where all of our links with parameters are being reported as duplicate; however, we have canonical tags in place and have Google set to ignore parameters.
However, when I run the site through Screaming Frog, all pages register 200s.