How come?

I just logged into chatroom and it came up like this

Welcome! You have entered [General Chat] at 4:09 pm
[General Chat]: annasavicha has entered at 4:09 pm
[General Chat]: has left at 4:09 pm


So who was the space who left as soon i entered?????????????


I tought maybe it s just me.........

So i re-logged in 4:10 and no one left after i came in........



Any explanations??????