IN and OUT traffic same

IN and OUT traffic same

Dear experts,

I have two interfaces on monitoring:
      Tu1 (source G0/0/1)

Tu1 - In-Out Traffic are different values
Gi1/0/1 - In-Out Traffic same all time

On both interfaces I use commands below:
 ip flow monitor MONITOR-1 input
 ip flow monitor MONITOR-1 output

RECORD-1, EXPORTER-1, MONITOR-1 configured as per Netflow Analyzer-> Export Flow section

Could you please advise why on G1/0/1 I doesn't have any difference on In-Out traffic?

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