Candles problem

Hello to FTO team, I have big problem with candles sometimes, they act strange, like if there were missing data or something, when I move to another candle there is sometimes missing part of that candle which only shows with next one but I need to know how candle closed (1 sec before closure) but probram sometimes show this M15 candle like 11:44:38 or 12:14:50 etc. in screens I show some three consequentive candles to see how they change with next candle. There is “gap” which was “filled” with next candle, this is happening a lot of times on EURUSD during august 2025 and it is damaging my backtesting.