Unaccounted for source and destinations below 2 hours

Unaccounted for source and destinations below 2 hours

Hi,
 
we have netflow proffessional 9.0 but as soon as we upgraded the capability to see the data less than 2 hours is lost.everything comes as unaccounted. if we increase the window more than 2 hours then it shows the data.
 
is this a bug?

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