Responsiveness/sizing issues with port theme

Hey guys,

I’m having an issue with the “home” section on the homepage of my blog.

I have the exact same blog twice:
The 1st on wordpress.com : http://samueltrepanier10.wordpress.com/
and
The 2nd on ww.wp.xz.cn (hosted by site 5) : http://new.samueltrepanier.com/
There you’ll see the “home” section on the homepage is too large and cause the whole text to shit, and a scrolling bar appear at the bottom.

Strangly, the first website on WP.com doesn’t have that issue concerning the width.
And the 2nd website (WP.org) pop that issue when I add the “home” section. Even without any picture, the width goes too large. A simple word makes that bug happen, the only time it doesn’t is when the “home” page is empty.

Thanks for your help.

Best,
Samuel