Live network usage graph shows negative numbers

What does it mean when the Live Network Usage graph starts showing large negative numbers for RX and TX?

It seems like whenever users report that they’re having phone issues, that graph is showing negative numbers, but sometimes it shows negative and everything is working fine. When we do have issues with the phones, it’s almost always that the person on the other end can’t hear us but we can hear them. I’ve tried using PuTTY to monitor Asterisk in verbose mode, but nothing’s jumping out at me as being a problem. We are on FreePBX, Asterisk version 13.27.1, and have Sangoma S500 phones.

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