Netflow v11 traffic discrepancy

Netflow v11 traffic discrepancy

We are currently monitoring netflow from a Cisco 5500x firewall. We have a server behind this firewall that connects to a remote device

Selecting remote device with destination of the server gives me 16GB
Selecting server with destination of remote device gives me 7GB
Remote device reports 380MB traffic

The time period for this is past 5 days. This unfortunately appears to be the norm, at present we have many remote devices whose traffic report differs greatly from what Netflow is reporting. Anyone else experienced this problem?