this is caused by way how NTA currently stores data in SQL server.
By default it stores 1 minute samples, by after 1 hour it aggregates them and store as 15 minutes samples, after a day it goes to 1 hour samples, and after 3 days the data are stored as daily samples. Only sample start time is preserved during this process, so NTA treats the flow as it lasted for whole rest of sample period.
When NTA than queries data, it adjusts the time range to cover beginning of nearest sample period, and shows flows which started later then that beginning.
So as 11/4/2012 is older than 3 days, the initial time is rounded to beginning of that day showing you all flows that started before 4pm that day.