Footer moving to the right on Post pages – fine on others

Hi there, just setting up my first ever wordpress site and am using thr oriental theme but have amended all the graphics etc.

Almost there on how I want the site apart from the footer.

On all main pages it is perfect but as soon as I click in to read a posted article the footer moves to the right. I have fiddled around with the css and the coding but can’t see what I am doing wrong.

In the footer.php file, if I move

<div id="footer">
<?php wp_footer(); ?>
</div>

to below

</div><!--/container-->

then it lines up fine on the post pages but every other page then screws up and the footer block moves over to the left.

I have the reading settings set so it shows a static home page and the posts page is labelled up as ‘Latest News’

Can anyone advise? Any help most welcome