Rsync not deleting files on destination

I've got a rsync script that backups file from disk1 to disk3. This works great however if there are extra files on disk3 they do not get deleted by the sync.

I'm syncing all folders from F-J

 rsync --progress -v --delete --delete-excluded -av --recursive /home/disk1/Files/[F-J]* /home/disk3/Backup/disk1

What am I missing? :wall:

Update: Found this:

Does this mean I cant get it to sync [F-J]? I need to sync /Files ?
How would I achieve the above then?