Unexplainable 404 in my Wordpress Monitor

[Happy-SEO]

Hi Guys,

We started a new website (far from complete) and i'm fixing some SEO problems. I have a SEO 404 monitor plugin and he gives me strange 404's that i can't find:

https://compleetverkleed.nl/feestkleding/www.compleetverkleed.nl/feestkleding
https://compleetverkleed.nl/rode-peper-pak/www.compleetverkleed.nl/feestkleding
https://compleetverkleed.nl/new-kids-kleding/www.compleetverkleed.nl/feestkleding
https://compleetverkleed.nl/fee-kostuum/www.compleetverkleed.nl/feestkleding

The 404 error code comes due to a double domain URL, and it happens only on the /feestkleding subdomain. When i check my original page, for example https://compleetverkleed.nl/rode-peper-pak/ there is only 1 internal link to /feestkleding but when i click on it, it works fine. Does anyone know how to fix this problem or where to look to see why this is happening?  (it happens on every page, not the 4 above > starting to come through in webmastertools also)

2.
https://compleetverkleed.nl/pa_categorie-sitemap.xml
https://compleetverkleed.nl/product_shipping_class-sitemap.xml
https://compleetverkleed.nl/featured_item_category-sitemap.xml
https://compleetverkleed.nl/post_tag-sitemap.xml
https://compleetverkleed.nl/featured_item_tag-sitemap.xml

This 404's are completely new for me and i don't know where to find this

Thanks!

[DirkC]

Hi,

Point 1 - you mix relative & absolute links in your source code. Example on your homepage - line 429 - you put  which leads to https://compleetverkleed.nl/www.compleetverkleed.nl - I guess it's the same thing on these other pages.

[Point 2 - these sitemaps are probably generated by the Yoast SEO plugin - see https://compleetverkleed.nl/sitemap_index.xml You will have to check the configuration of the sitemap module of Yoast - it could also be related to this Bug https://github.com/Yoast/wordpress-seo/issues/2172

rgds,

Dirk](www.compleetverkleed.nl)

[DirkC]

Unrelated to the original question - you might want to invest in a tool like Screaming Frog - there are several other issues with your site

• about 50 5xx errors
• a lot of 301 in your internal links.
• most meta descriptions / H1 titles seem to be missing
• load time issues
• mixed www/non-www urls - better to stick with one & redirect the other to the chosen version (duplicate content issue as content exists on 2 url's)

rgds,

Dirk