chatroom java

this isnt meant to be made as a complaint but more of a notification. ive noticed that after i connect to the chatrooms, and i can chat, and see people chat, that my scroll bar at the right side of the java window doesnt go down, it has the light gray look like when that there isnt people out of my view.but i can see people chatting that arent listed. i know they arent invisible because i ask them and 10-15 minutes later i can scroll down.again this isnt a complaint about the quality of the site, but merely something i know isnt working as intended.