Trouble with backtest

Hi, i have some strategies working fine on 1D time frame, but refusing to backtest on intraday time frames 15m, 5m..etc even thought are working fine on the chart, where i see entries, exists and the equity curve. They also refuse to trade on the Scan.
I read some posts on the forum about time intervals for intraday, Intraday setting, etc.. and checked all of these issues without result. Other strategies i own, very similar to these one and with same core logic worked fine. What may be happening?
Thx,

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