Why do my pages move horizontally : I am supporting a website: 

https://www.allcounted.com

If you first look at the home page or What's Hot page and then click the Subject or Country page in the top navigation, you would see the page move left a little.

I know this is a CSS issue, but I am unable to find out the CSS rules that creates  this issue. This website uses bootstrap-3.2.0 and some other tools.

Thanks for help!