canoncial url: ?view=featured

Hi,
want to optimize links for facebook with facebook debugger and there is something weird with my homesite.
everytime when i want to post a link to the homesite, he puts "?view=featured" after my domain.

and the debugger detects open graph warnings like:
og:image should be larger: Provided og:image is not big enough. Please use an image that's at least 200x200 px. Image 'http://www.mydomain.com/images/demo/news_blog_demo.jpg' will be used instead.

the folder /demo/... does not exists anymore, i also deleted tons of demo content and all featured articles.

if i inspect source code of my site, there is this line in head section:
<link href="http://www.mysite.com/?view=featured" rel="canonical" />

where can i disable this function?

UPDATE:
- added line to head <link href="http://www.mysite.com" rel="canonical" />
- added folder "demo" to images folder and added own image with same title "news_blog_demo.jpg"