Is this duplicate content?

Okay, so I'm currently building an authority site. So far I've got about 10 articles up and my niche is very broad there's alot of keywords to write about, but the problem is I checked copyscape's siteliner to see if I had duplicate content on my own site and it says I have 21% duplicate content, how?

My keyword is similar to "root samsung galaxy S5" "root nexus 5" basically how to's and tutorials I'm pretty sure my articles are unique it's just I use the same tutorial/how to structure on every article. I don't know if this tool is actually accurate but it has got me paranoid, what do you guys think?

I use this tool too http://www.plagscan.com/seesources/analyse.php

But how can tutorial/how to structure make your content 21% copied. Kindly share your website and the content part which you are facing duplication issue from copyscape, because as far as my experience, copyscape is a great tool for duplication checking.

andrewfench said:

But how can tutorial/how to structure make your content 21% copied. Kindly share your website and the content part which you are facing duplication issue from copyscape, because as far as my experience, copyscape is a great tool for duplication checking.

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It passes copyscape.

it's just I used another tool called siteliner which checks for duplicate content on your own website, and it gave me that. I guess it's not accurate because there's no way the articles are copied.

If another site copies your content....will your own content show up as duplicate content?

Do you have phrases that perhaps you copied? May be that is what that percentage is about.

yesman23 said:

It passes copyscape.

it's just I used another tool called siteliner which checks for duplicate content on your own website, and it gave me that. I guess it's not accurate because there's no way the articles are copied.

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How about it working? Is it free?