Hi,
The line you mentioned is right added in the plugin
ga("create", "' . $account . '", "auto");
ga("send", "pageview");'.$extra_required.'
ga("require", "ecommerce", "ecommerce.js");
For the moment I can only recommend you to deactivate the "universal analytics" in the plugin.
I'm trying to perform some tests because when I wrote the code for UA, I did it at 4am and send it to the HikaShop team for tests (because I do not have any google analytics account).
The code I shared wasn't supposed to be release without tests, I just write some "proof of concept" for the HikaShop team in order to improve the plugin and add a support to track the transactions when the order are confirmed by payment servers (like the paypal IPN).
Regards,