content widths, how come?

Hi i run two sites with the same Hueman theme, although one is wider than the other. Ive checked the site width is theme options and had a look intro the css, but i havent been able to solve it. I draugted at the posts to see if it was the featured images, but no change.

Site one is the content width i want.

http://www.music4tubers.com/

Site two is the one thats too wide.

http://www.howtomakecoolvideos.com/

Any help would be amazing!