The Min, Max and average values displayed in the upper graph are all based on the "Samples to Include" setting. If you have this set to 10, then these numbers only come from the last 10 selected samples. Changing this to 0 will show ALL samples.<br><br>I suspect that you have a "Samples to include" number set, and that the maximum values are "scrolling" off the old end of this sample set as new values are included/collected.<br><br><br>