Wierd issue with "do not disturb hours"

I have a weird issue. When I first got the watch I set sleeping hours from 13:30-09:00 (in hope that it could track my "siesta naps" too). I then realized that it doesn't actually track afternoon sleeping time so I switched the sleeping schedule to 23:30-09:00 and synched with the watch.

The issue is that the setting  "do not disturb" for notifications during sleeping time still has the previous sleeping time (13:30-09:00, so I don't receive notifications after 13:30).

I've tried setting the time through web and phone various times but still the "do not disturb" sleeping times do not update.For some reason, although the watch syncs it doesn't update this setting. I tried searching if I could set the sleeping time through the watch but it seems there is no way to do this.

Any advice?