The lure will run at about the same depth as the diver. The diver will run deepest and closest to the boat on a zero setting, shallower and farthest from the boat on a six setting.
Are you running the diver without a ring, with a small ring or with a large ring? Larger ring = more resistance = deeper running.
Are you running mono, braid or wire? Wire runs deepest, mono runs shallowest...