Ebay shipping is too cheap?

This thing sold for 145 and the guy sent me 194. I never posted a shipping price in the ad, only the dimensions so I guess Ebay said it would cost $48 to ship to the buyer and there are quoting me the seller around $14 UPS ground? Something smells fishy.....Ill ship it Monday, but I bet you a doughnut that the $14 will get it on the truck but Ebay will back charge me sometime in the future for the corrected amount ala FedEx, some mystery $50 on my monthly bill for some shipping surcharge.