Error on user logon "Ignoring roster push with a non matching from"

Hello

I'm getting this error as soon as a new user connect on our local ejabberd server:

     W/Roster: Ignoring roster push with a non matching 'from' ourJid='guest652822936911@cb.localchat.it' from='guest652822936911@cb.localchat.it/K6Chat'

and I'm not able to see the new user.

If I close the app and then re-open the app, I can see the new user. I think this may be a issue due to resource matters.

BTW, this error is generated on the class RosterPushListener, triggered on roster push.

Thank in advance for any help.