Thank you for the detailed report!
Forex Strategy Builder needs correct bar open times in order to produce a correct backtest. The program checks each bar of the data files at loading and ignores those bars with inconsistent open time.
In the case you report, each H1 bar must start at a round hour. However, your broker makes it strange. It looks like it suspends the trading between 23:00 and 23:10 for rollover calculation purposes. Usually, the brokers quote the market without interruption. What they do is to prevent actually trade executions. It is a problem, but not so big that in your case.
This particular case can be fixed with a modified script for exporting data from a MetaTrader chart.
The script must modify the open time of M15, M30, and H1 bars to change them from 23:10 to 23:00.
We already have Data export scripts attached to the Premium Club. You can try to modify it. if you have trouble with it, I'll be happy to help you.
Happy holidays and Trade Safe!