It's supposed to do that. Or at least people take advantage of the fact it does that. You'll have to add spaces to long lines to stop that from happening.
--- "Only things I approve of should exist." -some guy on the internet
Maybe the bug is the fact that the text boxes don't match up with their leaders (the triangle or the bubbles). That is a problem. Don't know if it could be fixed, though.
--- The what mentioned above is total fiction. Please don't take it seriously!