Router stats on Hub2

[#1]

Edited image below. I hope someone can provide an explanation.

The first device in that display.

Output recorded by the hub 2 as 0.0MB

Input recorded by the Hub 2 as 49.3GB

(second and third devices are switches. Fourth device is a VoIP thingy.)

[#2]

The switches are 'managed' (with their own IP connectivity). Hence the low-level recorded activity (DHCP 'n' that).

[#3]

A reboot of the Hub2 now shows that the counters are performing. But that leaves the question as to why output traffic stopped being counted on one device.

If anyone else has encountered/noticed this perhaps they have an idea?