The left this session but didnt really leave bug

Anyone notice this happening lately since 1.8? In group chat sessions when people leave, it usually says "Second Life: Yiffy Yaffle has left this session.". Lately i've been seeing this and then the very next post is by the same person and they never actually left. It's not just one person or one group either. It's all of them. Like this...

Yiffy Yaffle: Yea lol
Second Life: Yiffy Yaffle has left this session.
Yiffy Yaffle: What? No I didn't.
Someone Else: o.o

I believe this is a bug of some sort so I decided to post it here and see if more people knew about it. It's nothing importent but it's kinda odd. I used to joke around and say things like "Yiffy Yaffle has eaten this Session." but I assure that this time Second Life is the guy saying it. lol