Margin problem on some pages, not all

Hello,
The margins appear to be correct on most of our product pages such as on this FQ bow page
(URL: http://www.hornesarchery.com/index.php?main_page=product_info&cPath=49&products_id=266&zenid=8bcafd3b8fb2b59739076f8a3672ed95),

but I cannot figure out why they are not correct on other product pages such as this Mountain Bow page
(URL: http://www.hornesarchery.com/index.php?main_page=product_info&cPath=3&products_id=73&zenid=8bcafd3b8fb2b59739076f8a3672ed95%29;

on that page, the white background does not make it all the way to the right border. Based on some threads I’ve seen, I’ve tried various adjustments (in both the admin panel/layout settings & product listing and stylesheet) but cannot figure this one out. Could someone please help? I’m on v1.3.8, classic template.

Thanks,
Skyline2

First thing to try is to remove or rename two of your stylesheets. Zencart loads all stylesheets with the .css extension it finds in your template's css folder, so you have three (stylesheet.css, stylesheet_original.css and stylsheet_new.css) fighting each other.

Then I would try turning off the right sidebox column globally in admin since you aren't using it.