Google Indexing My Pages As https

For some reason Google is indexing my pages using https intead of http.

This is a big mystery to me since I don't have a SSL cert for the domain and never have. But yet Google is successfully crawling the pages with the https version and the title tags and descriptions are even showing correctly. But of course when you click on the Google link it takes you to the site with the SSL error instead of the page.

- I use canonical url's and have them set correctly
- I have a Google Webmaster tools account and everything appears to be in order

- I never changed the default .htaccess file but here it is:

# 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

- And my robots.txt file:

User-agent: *
Disallow: /wp-admin/
Disallow: /wp-includes/

Not sure how to stop this or fix it...

If anyone knows how I can solve this great mystery I would greatly appreciate it.

You should add this to your .htaccess

RewriteEngine On
RewriteCond %{HTTPS} on
RewriteRule (.*) http://%{HTTP_HOST}%{REQUEST_URI}

then login to google webmaster tools and request a resubmit because of major changes.