Strategy not open any positions

Hi, just general question. I develop some forex strategy bot that uses custom indicator. If I run it against backtest data in cTrader everything works great and strategy execute orders. But if I run on my demo account (it doesn't matters if it is added on trader tab or activate on Automate tab) strategy logs a message that is started but no one trade is executed. It is a mont since I start it. No error messages on log or something. Note: since start there was few situations that strategy should open trade but nothing happends. Is there something what I missed please?