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 :
Copy the link of event template you are having trouble with.
Open the link in the browser where you are signed in into FreeBusy. (This will open your FreeBusy Page)
Locate the troubleshooting toggle and turn it on.
Hover over the timeslot that you are having trouble with and see why it is not getting listed.