Okay as far as I can find our current hashrate is 750GH/s someone please correct me if I am wrong. Also as far as I know the last div before this one was Oct 7.

At the current difficulty this hashrate would produce about
 0.53318557 BTC Per Day
 3.73229898 BTC Per Week
 16.20884127 BTC Per Month

At the last difficulty which started on Nov 17 it would produce about
 0.61885251 BTC Per Day
 4.33196758 BTC Per Week
 18.81311635 BTC Per Month

At the difficulty that started on Nov 05 it would produce about
 0.73822262 BTC   Per Day
 5.16755831 BTC Per Week
 22.44196750 BTC Per Month

At the difficulty that started on Oct 26 it would produce about
 0.96483017 BTC Per Day
 6.75381116 BTC Per Week
 29.33083704 BTC Per Month

At the difficulty that started on Oct 16 it would produce about
 1.40880039 BTC Per Day
 9.86160271 BTC Per Week
 42.82753178 BTC Per Month
 
At the difficulty that started on Oct 06 it would produce about
 1.99269547 BTC Per Day
 13.94886829 BTC Per Week
 60.57794227 BTC Per Month

From Oct 7 to the 16 using 1.98 Per day we would of made about 17.82 Bitcoin
From Oct 16 to the 26 using 1.40 per day we would of made about 12.6 Bitcoin giving us about 30.42 Bitcoins
From Oct 26 to Nov 5 using 0.96 per day we would of made about 9.6 Bitcoin giving us about 40.02 Bitcoins
From Nov 5 to Nov 17 using 0.73 Per day we would of made about 8.76 Bitcoin giving us about 48.78 Bitcoins
From Nov 17 to Nov 28 using 0.62 per day we would of made about 6.82 Bitcoin giving us about 55.6

DO YOU SEE MY PROBLEM!! My best guess is Garr Fucked up the decimal maybe?