Webmaster Tools shows URL errors linked from http://com.example.www/:http

Question

I have a bog standard WordPress 4.2.1 site. I recently added it to Webmaster Tools and it is showing me URL errors (404s) that are linked from a weird URL: http://com.example.www/:http

(I have replaced my domain name with 'example'.)

There are two URL errors shown in Crawl > Crawl Errors > Smartphone:

• mobile/
• m/

When I click on either of this items, a popup appears telling me that Google could not crawl the page because it is non existent (which is true). When I click the Linked From tab, it shows that it is linked from http://com.example.www/:http

Where is this weird URL coming from?

EDIT:

The .htaccess is as follows:

# Begin default subdomain redirect #
RewriteEngine on
RewriteCond %{HTTP_HOST} ^example.co.uk
RewriteRule ^(.*)$ http://www.example.co.uk/$1 [R=permanent,L]

RewriteCond %{HTTP_HOST} ^example.com
RewriteRule ^(.*)$ http://www.example.com/$1 [R=permanent,L]
# End default subdomain redirect #

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

Answer 1

Do you have any .htaccess redirects other than the default WordPress redirects? Have you moved from another website recently or changed URL structure?

No harm running a quick crawl of your site with Xenu or Screaming Frog.

Sometimes you find weird stuff in Webmaster Tools usually from other people's websites, inbound links to pages that don't exist etc. It usually isn't worth losing sleep over.