Brocade Switch sFlow inaccurate speed

Brocade Switch sFlow inaccurate speed

We are evaluating a few different sFlow collector. We like Netflow Analyzer the most in term of UI, pricing ...

However, we have inaccuracy in Interface traffic Speed. We setup the same configuration on our Brocade switch to send sFlow to both Netflow Analyzer and WhatsUpGold. 

WhatsUpGold is giving the correct speed, but not NetFlow Analyzer. 

I don't know if it is because of the configuration on NetFlow Analyzer. Please advise 

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