You cannot specify more than one EJEJC_BEACON tracking URL per page. If you specify different URLs on different pages, only the URL on the last page where the buyer viewed their cart would be tracked.
You may wish to embed tracking code in a thank-you page instead of using EJEJC_BEACON -- see this help page for tips:
http://www.e-junkie.com/ej/tips.tracking.conversions.htm