When someone leaves or disconnects during the game, as you know, their attack and defense boost boxes disappear. I am reporting that the box's definitions stay. When you hover over where the box would've been if they were still in game, the definition pops up.
Although for some reason, the definitions only stay for some of the players. During my game with techgump (where I first discovered the bug), only 3/5 of the players still had the definitions.