Code:
SELECT * FROM `npc_spells` WHERE `id` >= 700 AND `id` <= 712;
SELECT * FROM `npc_spells_entries` WHERE `npc_spells_id` >= 700 AND `npc_spells_id` <= 712;
Did you re-run shared_memory.exe after deleting them from the database?
If you did not, chances are you rebooted the server and 'cleared' the overwrite bug temporarily and it picked up again.
Deleting the spells from the database isn't enough since spells are 'pre-loaded' into mmf files when [sm] is run and the spells were still accessible.