Sure you don't have two transactions? Cause I think you should have. Max of 10 per transaction.
Qt 5=.99*5 + 0.2618=4.95+0.2618= 5.2118 BTC
Qt 10=.99*5 + 0.2618=9.9+0.2618= 10.1618 BTC
5.2118+10.1618 +1 = 16.3736 which has been paid according to transaction id 0d438c5a4bf7c470a42291c1110b6d19393ce767df86e991dbca05382a04312d