something confusing about

hi
As the userguide says,in "less than 6 hours interval"report ,data of application is 10mins granularity.So i think it is a little confusing.
the data form the online demo.

from 2008-07-14 17:54 to 2008-07-14 17:55
Application Traffic Percentageoftotaltraffic
GGP_App 262.41KB 40%

from 2008-07-14 17:54 to 2008-07-14 17:56
Application Traffic Percentageoftotaltraffic
GGP_App 459.42KB 29%

Beacuse 17:54-17:55 and 17:54-17:56 are in the same "10 minuters interval" ,i think the Traffic data should be the same.But now they are not the same,one is 262.41,another is 459.42.
Could you exlain the logic of what the data form.

Thanks very much.