We noticed an odd situation with one of our servers. The processes probes have schedules to only have alarms happen at certain times of the week. When we set the days and times, we save the probe then we open it back up and the schedule is no longer set how we saved it. We have processes version 4.80. We have tried restarting the robot and the probes along with cleaning the niscache and none of it worked.
This is working as designed.
If you only want to include a timeframe that crosses the midnight hour, such as 21h00-03h00, you should instead create an exclude timeframe of 03h00-21h00.