The EOD bars appear to be correct, the M1 bars do not. You SC data is 1 minute ahead.
It'd be nice if you fix that too so the bar charts look the same as conventional trading platforms.

BTW, since you are putting UTC timestamps in the T6 files, your DLL should also adjust for daylight savings time. Or is the sierra chart data already in UTC time? As you know the UTC offset is different when in DST.