[amibroker] Why does changing the commission change the number of trades?

[Potato Soup <potatosoupz@xxxxxxxxx>]

It's this kind of thing that makes me very suspicious of AmiBroker. I set up my backtest to have $350k. I set margin to 25. I originally had commissions at $3 per trade and then changed them to $4.5 per trade. It resulted in 4 additional trades. Why? Why would changing this paltry variable by a buck fifty have any bearing on my trade entry??

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