Double count traffic on Procurve 8206

Double count traffic on Procurve 8206

I'm using jperf to generate traffic on HP procurve 8206 around 100Mbps via fast ethernet port.
But the Netflow analyzer display double count (around 200Mbps) on the 8026 interface.
I'm already enable sflow on every interface. My config for sflow export are list as detail below.
Do you have any suggestion ?

sflow 1 destination x.x.x.x 9996
sflow 1 sampling A1-A24 4096








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