Uncorrect statistics NetFlow

Hi!

I am using statistical analysis NetFlow v5.
The device CCR1036-8G-2S +, RouterOS version 6.37.1 (stable).
I collect statistics in NetFlow Analizer. When viewing video from youtube - is reflected in the statistics of communication with Google’s cache, but not with YouTube.
Tried other monitoring system - the situation is the same.

Can I somehow fix this display or configure?
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