If you don't see your timeslots appearing correctly on your FreeBusy page for your event template, you can find out the reason by troubleshooting.
Follow the steps to troubleshoot your availability :
Click on "Copy Booking Page" and open in the browser where you are signed in.
Click on appointment type which you wish to troubleshoot.
Locate the troubleshooting toggle on top and turn it on.
Hover over the timeslot that you are having trouble with and see why it is not getting listed.