I examined several pages of your site, including pages where you're using our cart to sell your software, and found that you appear to be using standard GA tracking code provided by Google, rather than our customized version of the GA tracking code, which is necessary for our built-in GA integration to work properly in all regards; you can obtain our version of the GA code here:
Make sure you use our version of the GA code on every page of your site where you wish to use GA tracking at all -- i.e., do not mix-match our custom GA code with Google's GA code on the same page nor across different pages of your site.
I'm not sure how you're getting Ecommerce Tracking data in GA at all, since we can only add Ecommerce Tracking code to thank-you pages we generate for you when we detect the buyer's browser has a GA tracking cookie that was set by our version of the GA tracking code. At any rate, using our version of the GA code should improve the quality of Ecommerce Tracking data you're getting. The Ecommerce Tracking data we provide is populated by a routine common to all merchants and transactions in our system, so "it is what it is" and can't be further customized for any particular merchant. It may also take a little time for GA to gather enough data to start producing meaningful reports.
Also bear in mind that GA-style tracking can never provide fully precise and accurate metrics, due to browser settings or add-ons that may interfere with setting or reading the GA tracking cookies. Despite this inherent imprecision, the factors which interfere and resulting degree of imprecision or "margin of error" will be consistent enough across any volume of visitors, such that GA metrics are still useful for comparing against each other within that common frame of reference -- e.g., before/after comparisons to determine the effect of some change on your site, or comparing the performance of different sales pages or channels, etc.