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Because night mode is forced on by system settings. For what it's worth I have no idea why your phone has system night mode. Mine doesn't because Google scrapped that. Did you root and turn it on?
Aaaaaaand it's back to doing night mode again.
::sigh::
It was 11.58pm (GMT) according to the post time-stamp when you made this post (6.00pm Local time according to Google), and the point I'm making is that if you still have your Custom 'Day' settings as 6.00am - 12.00am (midnight) and your night mode switched on at 12.00am (midnight) GMT, which it appears to have done, then your Custom time settings are GMT, not Local time.
When you had Night Mode controlled by your Custom schedule, what times did it switch on and off or did it not switch at all?.