Ok, when asking about these things - people are going to need to start providing necessary information. No one calls tech support and says, "My computer is broken tell me what is wrong with it."
You can access the forum by:
desktop
2 different IPB iOS apps
A mobile skin
Tapatalk (presumably in different OS flavors).
I assume you mean tapatalk, because I think that is where I saw this. It only means the member has had recent activity and have not logged out (they are "online" so to to speak).