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Same code indicator , same values on different brokers but on one not showing arrows

Hi, is there a particular reason why the same code of an indicator shows arrows on a broker (Darwinex) and not on another (IG)? The signal correctly works on both brokers showing the same values but when it comes to drawing arrows on one broker it doesn't show them (the signal to trade) while on

Slippage when backtesting a strategy?

Hi, I have been programming in MT4 for a couple of months now so forgive my silly question. when I test a strategy I notice that occasionally there is a slippage when opening some positions (long or short) and they coincidentally are equal to the current spread I set in the tester. I know the