Time difference between last seen and duration

[nettle]

Hello. I have the following timing problem. In the last seen column is the actual time when the given device was last seen, and in the length column in status does not match the actual. For example, the device that was lost at 10:42 shows that it has been missing for 1h and 20m, and now it is 12:16. The correct one is to show that it has been missing since 1h 34m. The difference is almost 20 minutes in less than 2 hours.

I have two different installations on separate machines. Time rushes to one, and lags behind to the other.
I am adding an attached screenshot.
Please help me to solve this problem.

[macan]

try to update monitor plugin
https://github.com/cacti/plugin_monitor

[nettle]

try to update monitor plugin
https://github.com/cacti/plugin_monitor

Ok. Now update on of the servers and wait for new device to going down and check the times

[nettle]

try to update monitor plugin
https://github.com/cacti/plugin_monitor

Plugin is updated on two servers, but problem is still there. In server1 time is going slow, but in server2 time is going faster just like before update.

[macan]

please report problem
https://github.com/Cacti/plugin_monitor/issues

[TheWitness]

Make sure time sync is enabled and you've configured the time zones on your pollers correctly.