From my experience with the tooltip, I found it would always adjusts to the size of the container you've placed it in.
So, if your tooltip is contained in a div with 30 px width, the message will be forced to fit that box as well. You can try to use CSS to modify the way it behaves, or you can increase the size of the tooltip's container. Let me know if you manage to fix it, or if you need further help.
In retrospect it appears that there has been writen some custom CSS for the Tooltip. After having removed this code Tooltip works as usual.