Are you still having trouble with this? Please note that the time slots in calendars are allowed times, not blocked times.
Another thing you might want to check is the router timezone and time. Router time is synchronized with time servers with NTP, so it’s normally current. But if the router is behind another router, and the other router blocks UDP port 123, the route might not be able to sync up with an NTP server. You’ll need to open up UDP port 123 on the other router. As a workaround, you can sync the router time manually with your browser in the System Settings page.
You may want to start with a single calendar with no domain names listed, before trying more complex scenarios.