User blog comment:Rappy 4187/Technical Update: May 20, 2015/@comment-1605682-20150521010800/@comment-24757753-20150521122453

Your CSS for the 'Latest Updates' header has a right margin of 10.5em and that is what's causing this.

'em' measurements will change depending on the font size - 1em equals the height of one letter. That means that the larger fonts have given you a larger margin than intended.