I see it on my iPhone on the bottom. If someone makes a comment or enters the room it pops up.
I see this on the bottom of my iPad. Very annoying. "Fembot: so and so has left the room." It's on there right now.
Close the chat. Look at your lower left corner of the page. Enable chat - click it. Go to Settings. Check the box next to Disable Chat. (Note - this doesn't work when you use the popup option). You need to do this without enabling the popup (should be called popout, IMO).On mine too.