I am also playing this on a flashcart on my DS. I can't remember if this occurred in the v3.01 patch, but it does occur in the beta 1 version. This is a very minor graphical error so if it's not fixable, not a problem.
EDIT: Also, another graphical glitch I noticed was the Magic Breath from the dragons. There is a corrupt text/sprite following the enemy equip. Either pulling the wrong character or overflow?