VLAN 6500 do not display correct values

VLAN 6500 do not display correct values

hi all,
i am getting a problem on Netflow Analyzer. VLANs layer 3 on 6509 do not display correct values, is there any option to configure?
they display almost 1kbps but the correct value is since 40-50 Mbps.

thanks
Marco

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