It is very annoying to try to join a room, but just the moment I am clicking the join button, the rooms scramble and I join one I wasn't intending to.

This happens constantly, and it could be prevented so easilly disabling room rearrangement whenever the mouse was hovering that screen.

try this, maybe help

You can also press "Go to Game" for more accurate selection. I actually like it because it helps with tracking and accuracy. Having a high hz monitor helps too.