Then i've checked the MT5 documentation and i found an error in the Time format of the generated csv files.
This is the correct time format get by official MT5 documentation: (HH:mm:ss)

This is the time format that Tickstory generate with the Pre-defined MT5 bar format:

as yu can see the output time is HH.mm.ss instead of HH:mm:ss!!!
I also tryed to create a custom format:

but nothing, same error: HH.mm.ss instead of HH:mm:ss...
At the end i found a temporary workaround in order to fix that issue just changing the "long time" format in windows regional settings:
Search -> Region -> Change data formats
and then just set the "Long Time" format with colons!
Note for tickstory developers:
Tickstory should ignore the regional settings and follow the custom format, can you fix that for the next release please?

