What about this (google crawl)?

[noodweerbenelux]

Recently we did a serious effort on SEO with SEO Yoast (Wordpress). And after a few months of tweaking old articles we get this impact on crawl search.. Is this graph normal?

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[MattAntonino]

Exactly this!  Thanks Dan for jumping in and finishing this thread! (My hero!)

[evolvingSEO]

Yes that is correct. And yes you already have "noindex subpages of archives".

Yes I have a very extensive article on Moz here: http://moz.com/blog/setup-wordpress-for-seo-success

I did I Mozinar here about wordpress: http://moz.com/webinars/hands-on-answers-to-the-most-asked-wordpress-qestions

I have a comparison of Yoast vs All In One here: http://www.evolvingseo.com/2014/02/14/all-in-one-vs-yoast-seo-test-drive/

[noodweerbenelux]

So, no index tags, categories & notatie?

And about 'noindex subpages of archives' - do we haven't already checked that box (look at the second print screen)? You have some other tips for Yoast?

[evolvingSEO]

You should definitely "noindex tags (that is what Matt was talking about to some extent).

I would also "noindex subpages of archives" in your Yoast settings as well.

Webmaster Tools and Google might not always react right away to certain site changes, which might be why you are seeing a delay.

[noodweerbenelux]

Hello

I don't get it. I had SEO Yoast for months and no problems till 2 weeks ago (graph). I even didn't change some settings. I just add structured data in webmaster tools.

This are my settings in SEO Yoast.

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[MattAntonino]

You activated duplicate content. It looks like two ways:

http://www.noodweer.be/tag/wolken/

and

http://www.noodweer.be/category/website/

So you have tags and categories unblocked.  I am going to guess you recently installed Yoast Wordpress SEO? It's not setup correctly so Google is crawling a LOT more content than they used to. Go through all settings, make sure you've got it setup properly and should go back to normal.

Start here: https://yoast.com/articles/wordpress-seo/

[noodweerbenelux]

The website we talk about it: http://www.noodweer.be. And what do u mean with unblock duplicated content? We have activated such things or we had duplicated content before and now not anymore?

[MattAntonino]

Looks like you unblocked some duplicate content maybe?  Tags, date archives, categories?  That would be my best guess. Without knowing the domain, it's hard to even look further than that, though.