Scheduling problem

I am running a diy emonpi, version low-write 9.8.25.
I wanted to divide my energy usage with day-night (night tariff is from 21.00 till 06.00 and in the weekends). So i created a schedule:

Tariff Night:
Mon-Fri | 00:00-06:59, 21:00-23:59, Sat-Sun | 00:00-23:59

but when looking to the graph, it does not record anything from 00:00 till 00:06. From 21:00 till 23:59 and on the weekends everything is recorded ok…
I could not find my mistake… any ideas? Or should I just use the tariff day I used and change the rule so that when that one isn’t active it’s night? (Tariff day: Mon-Fri | 07:00-20:59 )