In my model, I am using send to port by different percentages, port 1&2 - 25%, port 3 - 50%. My sample size is 1000 items but 100% of it goes goes to port 1 which has a probability of only 25%
Send to port by percentage: 100% to one port with 25% probability
FlexSim 23.2.2
You've set them all to go to port 1:
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