Value not updating in deltaV reporter

Dear all,
We are facing a problem in our plant that, the value is logging continously in Continous Historian but it is not updating in DeltaV reporter,instead it is showing #N/A.
If we update the same time interval after 2 hours, the values are coming perfectly.
We have found that value is updating in deltav reporter after every 2 hours. Pl find the attached screen shots.
Advanced thanks for your help.

Regards
Mithun Dan Thomas