This would be more properly fielded by Cavedude, as that script is his baby =)
Open your database and check the
spawn_condition table. Make sure that the 'value' field for the Warders row is set to 1, and that the value field for the Ancients row is set to 0. That should reset it.
Code:
'sleeper', 1, 1, 2, 'Warders'
'sleeper', 2, 0, 2, 'Ancients'