I would say that something (one of the top elements) is actually over 100% width or has some margin problems, you will probably find that you can scroll the page horizontally.
It looks like the content in the has a minimum-width set which is causing the “Anny” and “Gomes & Bilencourt” divs/containers to be too big. Coupled with the 100% width style attribute on the tag might be causing it to look like this instead of overflowing on the x-axis.