XMPP duplicate message when presence=available

Hi there,

I'm using Java and the Smack library to talk to Openfire 3.10.2 on Windows 7.

I use 2 Java sessions connected to Openfire.

These 2 sessions use the same user but a different resource.

I then send a pubsub message to a particular node in session 1, expecting it to reach session 2 once.

However the second session sees two messages instead of one.

I did some investigation and found this only happens if I change the "presence" of the user on the second session to "available".

Should "presence" change the messages in this way?

Thanks in advance,

Connor