Chat rooms don't show all the messages of star wall, if chatroom is opened from a low-resolution and/or small screen.
For example, below is the screenshot taken from my Macbook pro, 13 inch screen at resolution 1280x800, from chrome:
Freehand circle, courtesy of Shadow Wizard
The bug persists irrespective of browser. I have also tried it on various 15 inch screens with same resolution (1200x720) on Windows OS and Linux.
The starwall doesn't scroll down either, like the rest of chat, so I am not able to see the messages that are hidden below.