Error on duplicated content, but when checking shouldn't been possible

[Letty]

Dear all,

Every week I look at the different crawl reports for our website, since the start of my SeoMoz membership the Errors for duplicated content and duplicated Title is rising. But if I take out the .csv file and look in more detail, and select a pages which is marked as duplicated content, a canonical is actually existing on this page. So it shouldn't be an warning, I have no idea what the issue could be.

For example pagesare marked as duplicated content,

<colgroup><col width="966"></colgroup>
| http://www.zylom.com/es/descargar-juegos/3-en-raya/?sortby=2 |
| http://www.zylom.com/es/descargar-juegos/3-en-raya/?startnumber=60&sortby=2 |
| http://www.zylom.com/es/descargar-juegos/3-en-raya/?startnumber=80&sortby=2 |

the parameters after '?' (question mark) are necessary for our internal system. To overcome duplicated content we coded that a canonical tag onis placed on every page with parameters and the main page is

http://www.zylom.com/es/descargar-juegos/3-en-raya/

but it doesn't seem to work, because my error warnings are still rising.

Please advice me

Kind regards,

Ms Letty van Eembergen

[Letty]

HI Matt, thank you for pointing me in the right direction, will keep an eye on this update about new features.

[Matt-Williamson]

The SeoMoz crawl doesn't actually take into account your canonical tags at the moment but it is something they are looking into, so I wouldn't worry you are not the first to report this...

Have a look at this for peace of mind

http://www.seomoz.org/q/canonical-tag-and-duplicate-content-report