Is it possible that the 2012 subs were ordered seperate? If so, they wouldn't have been combined. Also there are a few shipping options available (USPS, UPS etc...) and shipping price varies between them.
I paid $8.20 shipping for FFM/Karatti by the cheaper shipping (that price includes the $4 discount and the $1.15 refund they sent me)
Though all sub items (within the same sub eg Ram Man/Jitsu in February) ship together and DO NOT ship seperate. Hope this helps!