Sametime Awareness mismatch

Randomly I will see someone in my inbox on sametime but in my sametime contacts they are offline:

See Jeffery M Lieberwirth here - in the inbox active on ST and in the contacts list (on the right) offline.

Subject: Me it is mostly the opposite

active in ST and no icon in the inbox.Sometimes it works, sometimes it does not.

Subject: Do you have more than 1 Sametime communities defined?

Subject: no