Pub sub node configuration problem

I have problem with my pubsub node configuration :

When i publish into my node, all subcribers received two time last item pubished.

I try more configuration by nothing works, here my last test :

pubsub#title", "MyNode"
pubsub#deliver_notifications", "1"
pubsub#deliver_payloads", "1"
pubsub#persist_items", "1"
pubsub#access_model", "open"
pubsub#publish_model", "publishers"
pubsub#purge_offline", "0" pubsub#send_last_published_item", "on_sub_and_presence"
pubsub#presence_based_delivery", "0"
pubsub#notification_type", "headline"
pubsub#notify_config", "0"
pubsub#notify_delete", "0"
pubsub#notify_retract", "0"
pubsub#notify_sub", "0"
pubsub#max_payload_size", "1028"

I just want that my subscribers received last published message even if this message has been sent when they are offline.
I don't know if my eJabberd config or if my node config is not right.

Can you help me ?

Thanks,