If the first message you get is extremely long in that it takes at least two lines to display them and a message immediately follows, the second message will be "ontop of" part of the first message. This is most easily seen in Strife with Phosphous Grenades and the next thing you pick up. Edit: Updated version number.

Here's a pic of what I see. [img:v3o2c34i]http://img477.imageshack.us/img477/6904/strifemessage4nt.th.jpg[/img:v3o2c34i]

Fixed.