The uptime column shows wrong details, longer than then expected. When compared to the Up Time in Task Manager there is a significant difference.
The issue might be caused by a corrupt WMI repository. The uptime counter is not taken from the task manager but via WMI.
To resolve the issue, run a "lodctr /r" command on the problematic server and then restart the ControlUp agent.
If that doesn't work, you may need to salvage the WMI repository by opening CMD and running the “winmgmt /salvagerepository” command. Then restart the server.