i want to say same as michael! i think they can not show online all members altogather! the load for server will be too much! so they show some limited number of online people!

It's called 'caching' - because there are too much users, the italki' owners try to reduce a workload on portal by updating some pages/data slower.

Mistery things.... To be or not to be, Online or Offline...that's the question

I'd like to know the same thing. The same thing happens to me. Send an email to customer service. I'll do the same. When I put myself as Online for online chat, it still says I'm offline.

You are offline for online chat