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What is the sample time period that gives you these traffic amounts?
If it's a few minutes, that's not really a tremendous amount of data. If the data delivery from your pollers is robust and this is a good-sized sample, then it's not impossible that the SQL server's side of the TCP conversation might add up a bit over time.
Anyway, let us know the time sample, and some other info about your pollers. How many nodes/interfaces/flows are the additional pollers monitoring? What does the IN graph look like between these nodes?