[Observium] tp-link uptime

Hi All

Im not sure if its Observium or TP-Link I should be asking really but ill ask in both places?

Observium told me, one of our switches rebooted (which seemed odd as nobody can gain physical access to it)

I checked observium and that shows an uptime of 16h 20m 30s

When I snmpwalk the switch I can see

DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (5883922) 16:20:39.22

But the TP-Link web panel shows RunTime: 332 day - 2 hour - 2 min - 39 sec ???

Any suggestions would be helpful :)

Regards

Simon