Simulation results changes when I increase the number of primary particles

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_Geant4 Version: geant4-11-01
_Operating System: Ubuntu 22.04

Hello everyone, I’m using geant4 to simulate Cerenkov based on the example OpNovice2. I get the result but I find that when I increase the number of primary e-, the result(namely the angular distribution of Cerenkov) changes, especially the peak, which is displayed as belows:

Then I run the 100events simulation 100 times seperately(also the 200events 50 times), and merge the results and compared to the 10000events. Surprisingly the results doesn’t match.
I wonder what reasons lead to this difference. Can anyone provide some possible reasons?

the comparison between 100events100times(merged),200events50times(merged) and 10000events

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