I have noticed something strange for some time now and I am not sure if it is a bug or something that I am doing wrong. I have a ping monitor and have created a graph for the ping loss. When I view the graph in a screen the plotted values change every 30 seconds. for example, here is one screen capture

and after the next screen update in 30 seconds

The next update will show the previous, lower, values. Why the changes between updates for values that should be the same?

and after the next screen update in 30 seconds

The next update will show the previous, lower, values. Why the changes between updates for values that should be the same?