YES, hankeys, you are completely right!
IT WAS ALL MY FAULT!!!
The downloaded sunday-data there begins exactly with 2019.6.16 21:00:00 and the previous week ends with 2019.6.14 20:59:00. I've completely overseen the switch between ".14" to ".16".
ADMIN, SORRY, could you delete my task or mark it as fixed???
you need to use cloned data to your broker time...dukascopy data are UTC0