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You did not provide enough information — which example EA's, what symbols, what are trading times for the symbol, what kind of test open bar or ticks, etc.
I will assume the following which usually causes that kind of behaviour:
- You are testing with open prices and your symbol's trading times prevent trading at the beginning of the day or the trading time is equal to or shorter than 8 hours.
You did not provide enough information — which example EA's, what symbols, what are trading times for the symbol, what kind of test open bar or ticks, etc.
I will assume the following which usually causes that kind of behaviour:
- You are testing with open prices and your symbol's trading times prevent trading at the beginning of the day or the trading time is equal to or shorter than 8 hours.
You did not provide enough information — which example EA's, what symbols, what are trading times for the symbol, what kind of test open bar or ticks, etc.
I will assume the following which usually causes that kind of behaviour:
- You are testing with open prices and your symbol's trading times prevent trading at the beginning of the day or the trading time is equal to or shorter than 8 hours.
Just as I suspected: 23:00 - 16:31 = 7:29 (it is less that 8 hours). Meaning that open prices or even with ticks where EA trades are only placed at the start of the bar, then there will be no trades for time-frames H8 and above.
Live or demo, makes no difference. It's the symbol's contract details and trade times that sets the conditions for the tests.

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