Looks like it's not an issue with my plugin then.
I figured it out, looks like an issue that occurs when the enemy you are facing is a SV_actor instead of the standard static battler image. When the enemy is a static image the HP displays normally. So for this sample project I included the animated enemies plugin.
http://www.mediafire.com/download/9nzitb3t4kppd9b/Project1.7z
