With the information provided its even hard to provide a wild guess. Did you use the exact same settings with the Playback mode and the strategy? Then I'm thinking about the playback settings, the strategy's Bar Magnifier, whether the strategy uses intra-bar order generation, and there are probably more nuances than this.
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I don't know if it will help, I am not an expert with NT 7 but I have observed a big difference in the fills between market replay and SIM trading and live trading.
In market replay the fill are too good. They are like if you had absolutely not latency in your connection with the market (0 slippage). In SIM vs real trading their are by far worst. Based on my experience the "real" results will be somewhere in between.
For example on 200T bars on CL the SIM gave me in average 5 or 7T of slippage based on how fast the market is, in live the slippage is more like 2 or 3T. In market replay it is almost 0 (not realistic).
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