Chart stuck not showing the changes in the tag value, Edge historian not working?

I am using one tag to plot the chart and it has History enabled Edge historian , it was working earlier but now seems to be stuck at the same value and shows the plot as if the value is not changing but my speed is changing a lot

Is your system licensed? If not, is the trial expired?

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I am using 2 hours trial which I reset after 2h time has elapsed , I am able to read the real time engine speed on the LED display however the historian shows the same values and chart also stuck at the same value