Just for gaining some extra moolah, lots of publishers jumped from Feedburner to Google System for their feeds in order to test the new system. Though Everything remained same but seems Google has not been able to iron out the bugs even now. Almost Daily huge fluctuations occur in our feed counts. Imagine this that feed count for NSpeaks was at 115 yesterday and today its 77. Even under rare circumstances this is not a digestable that feed counts can fluctuate so much.
I hope that Google fixes such troubles soon otherwise then these figures would lose trust soon and we will look have to alternative ways like registering for a fresh account at Feedburner to get proper statistics.