It appears your site is built in WordPress and has a "Google Analyticator" plugin installed, so that is probably conflicting with our version of the GA tracking code. If you want to use our GA code, you must use that code on every page where you wish to use GA tracking -- i.e., don't mix-match our GA code with any other GA code, whether on the same page or across different pages.
Also, the first purchase button on your page is not displaying our standard overlay-style cart "inside" your page, so any purchases made through that button would not engage our GA tracking code properly. The second purchase button further down on that page is opening the overlay cart, so you may just need to copy that button and paste it in place of the first button you currently have there.
It also appears you are redirecting to a Common Thank-you Page URL on your site, so you should also paste our version of the GA tracking code into that page (our docs only say that you should not add this code to your standard E-junkie-generated thank-you pages). In this case, you would be giving up GA Ecommerce Tracking, which will only work with your standard E-junkie-generated thank-you pages. If you prefer to use Ecommerce Tracking, you can go to Seller Admin > Account Preferences and delete your Common Thank-you Page URL there.