Extra Right Margin on iPhone

I am editing a mobile CSS file for a news site. On the iPhone 3gs, 4 and the simulator there are several pages (not all), there is an additional right margin.

Here is an example page with an additional field:

http://bit.ly/mMA2q7

.. and here is an example page without it:

http://bit.ly/iQeOGY

Both pages use the same template. I assume the images add an extra margin.

Here is our mobile CSS file http://bit.ly/iW5JVm and viewport:

<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=1;"/> 

I tried applying different min-width values ​​to the body, but could not find a solution.

Do you know how to get rid of this extra difference on iPhone?